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mustn't

[muhs-uh nt] /ˈmʌs ənt/
1.
contraction of must not.
Usage note
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for mustnt

mustn't

by mid-18c., contraction of must not; see must (v).

Online Etymology Dictionary, © 2010 Douglas Harper
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