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Contraction of the words must, not, and have. An extension of the common contraction, mustn't. This is an extreme contraction. Please use it with caution.
I mustn't've have taken my car keys with me because I don't have my car keys with me.
by BryceM August 11, 2006
14 5

Words related to mustn't've:

have must mustn't not contractions