Definition of ain’t short form from the Oxford Advanced Learner's Dictionary



     short form
    short form
    BrE BrE//eɪnt//
    ; NAmE NAmE//eɪnt//
    (non-standard or humorous)
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  1. 1am not/is not/are not Things ain't what they used to be.
  2. 2has not/have not I ain't got no money. You ain't seen nothing yet. More Like This Contractions in non-standard language ‘nother, ain’t, doncha, dunno, ‘em, gonna, gotcha, gotta, innit, wanna, ya, yerSee worksheet.
  3. Idioms
    if it ain’t broke, don’t fix it
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    (informal) used to say that if something works well enough, it should not be changed
See the Oxford Advanced American Dictionary entry: ain’t