Definition of mightn't in English:

mightn't

Syllabification: might·n't
Pronunciation: /ˈmītnt
 
/

contraction

Might not: you mightn’t believe it, but I saw him stop a fight
More example sentences
  • It's sort of eerie writing/talking as though there's someone else here when there mightn't be anyone at all.
  • I try to showcase music that mightn't necessarily get heard if I didn't play it but also have a great atmosphere and never forget that music is about enjoyment.
  • They might have tips that the medical profession mightn't.

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Pronunciation: vəˈt(y)o͞opəˌrāt
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blame or insult (someone) in strong language...