Meaning of “mustn't” in the English Dictionary

british dictionary

"mustn't" in British English

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mustn't

uk /ˈmʌs.ənt/ us /ˈmʌs.ənt/

short form of must not:

You mustn't worry too much about this.

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(Definition of “mustn't” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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