Usually means: Obligated not to; prohibition expressed.
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We found 12 dictionaries that define the word mustn't:

General (12 matching dictionaries)
  1. mustn't: Merriam-Webster
  2. mustn't: Oxford Learner's Dictionaries
  3. mustn't: American Heritage Dictionary of the English Language
  4. mustn't, mustn't: Collins English Dictionary
  5. Mustn't, Mustnt, mustn't, mustnt, mustnt: Wordnik
  6. mustn't: Cambridge Advanced Learner's Dictionary
  7. mustn't: Wiktionary
  8. mustn't: Webster's New World College Dictionary, 4th Ed.
  9. mustn't: The Wordsmyth English Dictionary-Thesaurus
  10. mustn't, mustnt: Dictionary.com
  11. Mustn't: Wikipedia, the Free Encyclopedia
  12. mustn't: TheFreeDictionary.com

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Definitions from Wiktionary (mustn't)

▸ verb:  must not (negative auxiliary); used to indicate that something is forbidden or, in a tag question, that something is not necessary.


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