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.

More examples

  • You mustn't go into the garden.
  • Tell them they mustn't make too much noise.
  • You mustn't leave litter lying around.
  • I mustn't forget my keys.
  • She mustn't feel she has to pay.

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

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