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TAKE THE QUIZ“it ain't”
The following 2 entries include the term it ain't.
if it ain't broke, don't fix it
proverbial saying—used to say that one should not try to change something that is working well
it ain't over until/till the fat lady sings
idiom—used to say that the final result of something (such as a sports contest) has not yet been decided and could still change
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Merriam-Webster unabridged
