There are 2 definitions of ass in English:

ass1

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noun

1A hoofed mammal of the horse family, which is typically smaller than a horse and has longer ears and a braying call.
  • Genus Equus, family Equidae: E. africanus of Africa, which is the ancestor of the domestic ass or donkey, and E. hemionus of Asia
More example sentences
  • This family, made up of the horses, asses and zebras, contains one genus with nine species.
  • Similarly, one ‘kind’ was likely ancestral to the various types of horses, zebras and asses.
  • Today only seven species of wild equids remain - three asses, three zebra and one wild horse - and IUCN-The World Conservation Union now lists most of these as endangered.
Synonyms
donkey; jackass, jenny; Scottishcuddy
British informal moke, neddy
1.1(In general use) a donkey.
More example sentences
  • Need I remind you gentlemen, that an ass is a donkey.
  • Then be called ten times a donkey, and a mule, and an ass, and begone, or I'll clear the world of thee!
  • But did Avraham sell Sara to an imperial Pharaoh in exchange for sheep, cattle, donkeys, servants, maids, asses, and camels?!
2British informal A foolish or stupid person: that ass of a young man
More example sentences
  • The silly ass asked the electors: ‘Who governs Britain?’
  • They are seen for the foolish bunch of asses that they are.
  • The fact might well be forgotten, but there are stupid asses who will not let us forget it.
Synonyms

Origin

Old English assa, from a Celtic word related to Welsh asyn, Breton azen, based on Latin asinus.

Phrases

make an ass of oneself

informal Behave in a way that makes one look foolish or stupid: I made an awful ass of myself
More example sentences
  • Somewhere behind it all, however, lies the splendid and irrepressible urge to get up in public and risk making an ass of yourself for the sake of art.
  • We are not all mad violent alcoholics or binge drinkers whose only form of entertainment consists of trying to enter pubs in the hope of getting very drunk and making an ass of ourselves!
  • I'm pretty sure Jessica holds her liquor better than I hold mine, because I distinctly remember making an ass of myself twice in her presence, and her not even one time at all.

Definition of ass in:

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Word of the day inamorata
Pronunciation: ɪˌnaməˈrɑːtə
noun
a person's female lover

There are 2 definitions of ass in English:

ass2

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Pronunciation: /ɑːs
 
, as
 
/

noun

North American vulgar slang
1A person’s buttocks or anus.
1.1 [mass noun] Women regarded as a source of sexual gratification.
1.2Oneself (used in phrases for emphasis).

Origin

variant of arse.

Phrases

bust one's ass

Try very hard to do something.

chew (someone's) ass

Reprimand (someone) severely.

drag (or tear or haul) ass

Hurry or move fast.

get your ass in (or into) gear

Hurry.

not give (or care) a rat's ass

Not care at all about something.

put (or have) someone's ass in a sling

Get someone in trouble.

whip (or bust) someone's ass

Beat someone in a fight or contest.

Derivatives

assed

adjective
[in combination]: fat-assed guys

Definition of ass in: