Definition of mouth in English:

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Pronunciation: /mouTH/
(plural mouths /mouT͟Hz/ /mouTHs/)
1The opening in the lower part of the human face, surrounded by the lips, through which food is taken in and from which speech and other sounds are emitted.
Example sentences
  • As he looked right at me, cigarette teetering on his lower lip with his mouth slightly open, he didn't flinch.
  • He lowered his mouth to her shoulder blade, running his lips lightly over the skin.
  • You can tickle your baby's chin or lower lip so the baby will open its mouth.
lips, jaws;
maw, muzzle
informal trap, chops, kisser, puss
1.1The corresponding opening through which an animal takes in food (at the front of the head in vertebrates and many other creatures), or the cavity behind this.
Example sentences
  • Those that survive to become tadpoles often have misshapen mouths and are unable to feed properly.
  • In some vultures, the adults instead regurgitate food into the mouths of the chicks.
  • In addition to two eyes and a mouth, this animal has markings suggesting gills.
1.2 [usually with adjective] A horse’s readiness to feel and obey the pressure of the bit in its mouth: the horse had a hard mouth
More example sentences
  • The horse with the hard mouth almost immediately begins to lean on the bit.
  • Another thing he looks for is a deep mouth as this will aid him later on in the training.
  • A horse with a hard mouth is basically immune to the amount of pressure given by the bit.
1.3The character or quality of a wine as judged by its feel or flavor in the mouth (rather than its aroma).
Example sentences
  • This medium bodied wine's mouth is filled with a carry over of the nose's raspberries and strawberries.
  • The mouth of the wine is full bodied with flavors of ripe berries and soft, supple fine grained tannins.
1.4 informal Talkativeness; impudence: you’ve got more mouth on you than anyone I’ve ever known
More example sentences
  • I am surprised you never came to visit me at my gym when you were training in Las Vegas since you have so much mouth when it comes to me.
  • ‘He's got a lot of mouth,’ said Miranda.
  • She had a bit too much mouth and not enough brain.
2An opening or entrance to a structure that is hollow, concave, or almost completely enclosed: standing before the mouth of a cave
More example sentences
  • The Shrine is within a massive cave, the mouth of which is about 150 ft wide.
  • He sees a movement up there, on the slope, near the mouth of the cave.
  • On the opposite bank, just 30 ft from the river and six feet above its normal level, is the wide mouth of the cave.
2.1The opening for filling or emptying something used as a container: the mouth of the bottle
More example sentences
  • It fits the mouth of the container and is locked tightly.
  • The other uncorks a bottle of chilled beer, and after cleaning the mouth of the bottle with her tongue, she places the beer in my hand.
  • From the mouths of the bottles, big drops of water pop up in time to a complex, computer-controlled, choreographed program.
opening, rim, lip
2.2The muzzle of a gun.
Example sentences
  • He passed the anti-aircraft ships at less than mast height in the very mouths of their guns and launched a torpedo at point blank range.
  • It was the cold mouth of the gun against my temple as I sat behind the wheel of my car that alerted me to the fact that it was indeed a hijack.
  • The second mass of shot is placed in a wad with its base pointing towards the gun mouth, in the direction of firing.
2.3The opening or entrance to a harbor or bay: walking to the mouth of the bay to absorb the view
More example sentences
  • I felt woefully under waterproofed to face the weather beyond the harbour mouth.
  • Aitchison argues that had the harbour mouth been widened, more of the boats would have stood a chance of making it to safety.
  • It is expected to arrive at the mouth of Cork Harbour next Friday where it will be winched into the water.
2.4The place where a river enters the sea.
Example sentences
  • The local governor was asked by the French commander if it would be allowed to fire a salute as it entered the mouth of the river.
  • Anglers in South Africa still target sharks, especially off the long beaches facing the Indian Ocean and in river mouths and estuaries after heavy rain.
  • Fish farmers are also under fire over siting farms close to river mouths.


Pronunciation: /mouT͟H/
[with object]
1Say (something dull or unoriginal), especially in a pompous or affected way: this clergyman mouths platitudes in breathy, soothing tones
More example sentences
  • Now she mouths all the normal platitudes about how the Real Message of the Gospel is Social Justice.
  • The environment minister is being condemned for mouthing politically correct platitudes.
  • Instead of mouthing platitudes about creating just and lasting settlements, we must turn the financial screws on both parties to make them see sense.
say insincerely, say for form's sake, pay lip service to
1.1Utter very clearly and distinctly: she would carefully mouth the right pronunciation
More example sentences
  • I, in turn, pointed at myself and just as clearly mouthed out my name, ‘Lani’.
  • Emily mouthed the words carefully as she faced him. ‘Thank you so much, Mr. Smith.’
  • His teacher was mouthing each letter sound and having him repeat sequences.
1.2Move the lips as if saying (something) or in a grimace: she mouthed a silent farewell [with direct speech]: “Come on,” he mouthed
More example sentences
  • His lips began moving rapidly, mouthing the words to a prayer.
  • Some mouthed silent words of thanksgiving while others joyfully praised the God of creation.
  • Mel mouthed the word ‘FAREWELL’ to him as she waved.
2Take in or touch with the mouth: puppies may mouth each other’s collars during play
More example sentences
  • Puppies like to mouth their owners' hands.
  • Dogs tend to mouth each other when playing.
  • My baby likes mouthing and chewing hard veggies.
2.1Train the mouth of (a horse) so that it responds to a bit.
Example sentences
  • If you're mouthing a young horse for the first time, start out by getting a few really good training books.
  • Mouthing a pony is the initial stage of breaking a pony and getting him to get used to the fact that he is going to be ridden.
  • The horse was mouthed properly as a youngster.



a mouth to feed

A person, typically a child, who has to be looked after and fed: how can they afford another mouth to feed?
More example sentences
  • For me, you are a mouth to feed, less important than the donkey.
  • Her step father gloated about how he got rid of a mouth to feed and how he didn't have to pay taxes for another three years!
  • It does not matter to him now whether or not the baby is male or female because it would just be one more mouth to feed.

be all mouth

informal Tend to talk boastfully without any intention of acting on one’s words.
Example sentences
  • He said that local politicians ‘were all mouth and no action’ on the issue and surely they could be doing more.
  • ‘I guess it's just another case of a man who's all mouth and no trousers…’ I giggle, before climbing the stairs to my sanctuary.
  • He has acquired a bit of a reputation for being all mouth and no trousers.

keep one's mouth shut

informal Not say anything, especially not reveal a secret: would he keep his mouth shut under interrogation?
More example sentences
  • He didn't want to say anything, so he kept his mouth shut.
  • Don't sign anything, keep your mouth shut, and remember that we never had this conversation.
  • You kept your mouth shut or you were killed.
say nothing, keep quiet, not breathe a word, not tell a soul
informal keep mum, not let the cat out of the bag

open one's mouth

informal Say something: sorry, I’ll never open my mouth about you again
More example sentences
  • I try to assume less before opening my mouth or offering information.
  • You didn't even manage to get accurate information before you opened your mouth.
  • After spending a great deal of the 1990s making speeches on education, I took a vow never to open my mouth on the subject again, at least in public.

watch one's mouth

informal Be careful about what one says.
Example sentences
  • In the locker-room, too, he will have to watch his mouth.
  • After warning him to watch his mouth once again he walked off with his dogs.
  • I know damn well what I'm saying, and no way in hell am I watching my mouth.

Phrasal verbs

mouth off

informal Talk in an unpleasantly loud and boastful or opinionated way: he was mouthing off about society in general
More example sentences
  • When he mouths off to a pretty young teacher, he apologizes: ‘I'm sorry I sounded off on you.’
  • Nobody shows off or mouths off quite as good as a Leo.
  • If a kid mouths off, maybe he doesn't like you or maybe he's seen his mother beaten up by her boyfriend.
(mouth off at)1.1 Loudly criticize or abuse.
Example sentences
  • She had had to endure being mouthed off at all her childhood.
  • And so when someone blows up and mouths off at a guard or goes after somebody else about their kids, I totally understand where that emotion and that lightning-fast trigger comes from.
  • Some guy mouths off at him and they begin brawling.
talk insolently, be disrespectful



Pronunciation: /ˈmouT͟Hər/
Example sentences
  • ‘Mouthing off’ is cause for violent arrest - even when, as in an airplane cabin, the ‘mouther’ is unarmed.
  • Indeed, I would go so far as to say that ‘a mouther’ is of no benefit to any team and I myself never picked one.
  • He's a mechanical mouther of sweet nothings, the kind of things lonely, needy women typically - or stereotypically - want to hear.


Pronunciation: /ˈmouTHləs/
Example sentences
  • And marching behind the mouthless cat came an endless stream of fuzzy animals, sugar-sweet fashions and girl singing groups.
  • Charles Hamilton Sorley, a Great War poet, once wrote an achingly poignant poem about the ‘millions of mouthless dead’ whose individual identity had been smothered by their ubiquity.
  • The painting is symbolic of the constant search for an identity by the woman, who remains mouthless in the entire series.


Old English mūth, of Germanic origin; related to Dutch mond and German Mund, from an Indo-European root shared by Latin mentum 'chin'.

Words that rhyme with mouth

Louth, mouth-to-mouth, south

For editors and proofreaders

Syllabification: mouth

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