ain't

UK: /ˈeɪnt/ US: /eɪnt/ ,(ānt)

WordReference Random House Learner's Dictionary of American English © 2025

ain't /eɪnt/   v. 

1. Nonstandard except in some dialects. am not;
   are not;
   is not:
   Well, it just ain't right.
2. Nonstandard. have not;
   has not;
   do not;
   does not;
   did not:
   I ain't got nobody.

WordReference Random House Unabridged Dictionary of American English © 2025

ain't  (ānt), 

1. [Nonstandard except in some dialects.] am not;
   are not;
   is not.
2. [Nonstandard.] have not;
   has not;
   do not;
   does not;
   did not.

• 1770–80; variant of amn't (contraction of am not) by loss of m and raising with compensatory lengthening of a; compare aren't

Usage

As a substitute for am not, is not, and are not in declarative sentences, ain't is more common in uneducated speech than in educated, but it occurs with some frequency in the informal speech of the educated, especially in the southern and south-central states. This is especially true of the interrogative use of ain't I? as a substitute for the formal and--to some--stilted am I not? or for aren't I?, considered by some to be ungrammatical, or for the awkward--and rare in American speech--amn't I? Some speakers avoid any of the preceding forms by substituting Isn't that so (true, the case)? Ain't occurs in humorous or set phrases:
Ain't it the truth! She ain't what she used to be.
It ain't funny.
The word is also used for emphasis:
That just ain't so!
It does not appear in formal writing except for deliberate effect in such phrases or to represent speech. As a substitute for have not or has not and--occasionally in Southern speech--do not, does not, and did not, it is nonstandard except in similar humorous uses:
You ain't heard nothin' yet!
See also aren't. 

Collins Concise English Dictionary © HarperCollins Publishers::

ain't / eɪnt/ contraction

1. am not, is not, are not, have not, or has not: I ain't seen it