American English

Definition of ain't short form from the Oxford Advanced American Dictionary

     

    ain't

     short form
    short form
    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!
  3. Idioms
    if it ain't broke, don't fix it (informal)
     
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    used to say that if something works well enough, it should not be changed
See the Oxford Advanced Learner's Dictionary entry: ain't