Meaning of “mightn't” in the English Dictionary

british dictionary

"mightn't" in British English

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mightn't

uk /ˈmaɪ.tənt/ 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 almost wondered if he mightn't be right.

(Definition of “mightn’t” from the Cambridge Academic Content Dictionary © Cambridge University Press)