There are 2 main definitions of nag in English:

nag1

Syllabification: nag
Pronunciation: /naɡ
 
/

verb (nags, nagging, nagged)

[with object]
1Annoy or irritate (a person) with persistent fault-finding or continuous urging: she constantly nags her daughter about getting married [with infinitive]: she nagged him to do the housework [no object]: he’s always nagging at her for staying out late
More example sentences
  • I'm a formerly skinny guy who has put on quite a bit of weight after my girlfriend nagged me constantly to do so.
  • We extend a welcome to all you women who constantly nag your husbands to complete those unfinished jobs, now is your chance to learn the skills yourself.
  • He keeps telling me I need to exercise and he nags me about it constantly, also commenting on what I should eat and ways to fight nausea.
Synonyms
harass, badger, give someone a hard time, hound, harry, criticize, carp, find fault with, keep on at, grumble at, go on at;
informal hassle, get on someone's case, ride
shrewish, complaining, grumbling, fault-finding, scolding, carping, criticizing
1.1Be persistently painful, troublesome, or worrying to: [no object]: something nagged at the back of his mind
More example sentences
  • She hears it every day, niggling and nagging in the back of her mind, reminding her that she failed.
  • The only faint worry still nagging at the back of his mind was about his dream.
  • But there are nagging doubts about just how durable this recovery really is.
Synonyms
persistent, continuous, niggling, unrelenting, unremitting, unabating

noun

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1A person who nags someone.
More example sentences
  • Women put up with it because we don't want to be perceived as nags or, worse still, incompetent.
  • What I am getting at is, what if this person was a nag or very critical?
Synonyms
shrew, harpy, termagant, harridan
archaic scold
1.1A persistent feeling of anxiety: he felt once again that little nag of doubt
More example sentences
  • It's a persistent nag, an ever-present question mark.

Origin

early 19th century (originally dialect in the sense 'gnaw'): perhaps of Scandinavian or Low German origin; compare with Norwegian and Swedish nagga 'gnaw, irritate' and Low German (g)naggen 'provoke'.

Derivatives

nagger

noun
More example sentences
  • There are plenty of knockers and naggers over there.
  • Jessica's parents never seemed relaxed because they were constant worriers and even worse naggers.
  • Consider telling someone who is not a nagger or blamer.

naggy

adjective
More example sentences
  • The local men are also allowed to drench naggy or annoying women with cold water - ‘to chase the evil spirits away’.
  • ‘Geez, you sound like a naggy annoying married couple,’ Julia commented.
  • You might worry that you sound naggy / girly, but arguably, you have no idea how he would hear such things.

Definition of nag in:

There are 2 main definitions of nag in English:

nag2

Syllabification: nag
Pronunciation: /naɡ
 
/

noun

informal , often derogatory
1A horse, especially one that is old or in poor health.
More example sentences
  • He'd come all the way on a poor nag who should have been retired to the pastures a long time ago.
  • I'll never forget the look on her face the first time she sat on the old nag!
  • They weren't exactly a friendly group - they had hard, cold eyes, and those that rode on horses had only nags.
Synonyms
worn-out horse, old horse, hack
informal plug
archaic jade
1.1 archaic A horse suitable for riding as opposed to a draft animal.

Origin

Middle English: of unknown origin.

Definition of nag in: