mustn't

must-n't · contraction

imported

Definitions

contraction

  1. 1.

    Contraction of "must not," used to express prohibition or strong advice against something.

Related words

Antonyms: have to, must
See also: cannot, must, shouldn't
Synonyms: must not

Etymology

Contraction of "must not," where must derives from Old English moste, past tense of motan ("to be allowed").