mightn't Meaning in the Cambridge English Dictionary
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Meaning of “mightn't” in the English Dictionary

"mightn't" in British English

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mightn't

uk   us   /ˈmaɪ.tənt/
short form of might not: Don't ​panic - it mightn't be ​true.
(Definition of mightn't from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mightn’t" in American English

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mightn’t

 us   /ˈmɑɪ·t̬ənt/
contraction of might not: I ​almostwondered if he mightn't be ​right.
(Definition of mightn’t from the Cambridge Academic Content Dictionary © Cambridge University Press)
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