To kvetch is to grumble and complain at length. Kids who kvetch for days about never having gone to Disney World are unlikely to convince their parents to take them.

When you kvetch, you whine or grumble or bellyache about something. It's an informal way to describe a very annoying activity, and you can also call the complaint itself a kvetch, as well as the person doing the complaining. In fact, this is the original Yiddish meaning, from kvetshn, "squeeze" or "press," which has a German root, quetsche, or "crusher."

Definitions of kvetch
  1. verb
    express complaints, discontent, displeasure, or unhappiness
    synonyms: complain, kick, plain, quetch, sound off
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    cheer, cheer up, chirk up
    become cheerful
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    hen-peck, nag, peck
    bother persistently with trivial complaints
    backbite, bitch
    say mean things
    grizzle, whine, yammer, yawp
    complain whiningly
    croak, gnarl, grumble, murmur, mutter
    make complaining remarks or noises under one's breath
    grouch, grumble, scold
    show one's unhappiness or critical attitude
    utter words of protest
    express discontent
    beef, bellyache, bitch, crab, gripe, grouse, holler, squawk
    inveigh, rail
    complain bitterly
    bemoan, bewail, deplore, lament
    regret strongly
    complain about; make a charge against
    talk whiningly
    declaim, inveigh
    speak against in an impassioned manner
  2. noun
    (Yiddish) a constant complainer
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    type of:
    bellyacher, complainer, crybaby, grumbler, moaner, sniveller, squawker, whiner
    a person given to excessive complaints and crying and whining
  3. noun
    (Yiddish) a nagging complaint
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    type of:
    an expression of grievance or resentment
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