Definition of mustn't in English:

mustn't

Syllabification: must·n't
Pronunciation: /ˈməsənt
 
/

contraction

Must not.
More example sentences
  • There is much twisted and tangled negotiating over who we must and who we mustn't invite.
  • We mustn't be afraid to experiment and mustn't be ashamed or disheartened by any mishaps along the way.
  • So I thought, if it's man made, there must be someone driving it, mustn't there?

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noun
the outward appearance or apparent form of something…