There are 2 definitions of nag in English:

nag1

Line breaks: nag
Pronunciation: /naɡ
 
/

verb (nags, nagging, nagged)

[with object]
1Harass (someone) constantly to do something that they are averse to: 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, keep on at, go on at, harp on at, badger, keep after, give someone a hard time, get on someone's back, persecute, chivvy, hound, harry, bully, pick on, criticize, find fault with, keep complaining to, moan (on) at, grumble at, henpeck, carp at, scold, upbraid, berate
informal hassle
North American informal ride
Australian informal heavy
shrewish, complaining, grumbling, fault-finding, scolding, carping, cavilling, criticizing
1.1 [no object] Be persistently painful or worrying to: 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, lingering, niggling, troublesome, unrelenting, unremitting, unabating; aching, painful, distressing, worrying

noun

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1A person who nags someone to do something.
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
1.1A persistent feeling of anxiety: he felt a 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:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose

There are 2 definitions of nag in English:

nag2

Line breaks: nag
Pronunciation: /naɡ
 
/

noun

informal , often derogatory
1A horse, especially one that is old or in poor health: the old nag the lad fetched smelled sweaty
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, Rosinante
informal bag of bones
North American informal plug, crowbait
Australian/New Zealand informal moke
British informal , dated screw
archaic jade, rip, keffel
1.1 archaic A horse suitable for riding rather than as a draught animal.

Origin

Middle English: of unknown origin.

Definition of nag in: