Usually means: Obligated to avoid or refrain.
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We found 3 dictionaries that define the word must not:

General (3 matching dictionaries)
  1. must not: Merriam-Webster
  2. must not: Collins English Dictionary
  3. must not: Wiktionary

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Definitions from Wiktionary (must not)

▸ verb:  Used to indicate that something is forbidden.

Similar:
may not, mustn't, can't, cannot, need not, taboo, shouldn't, don't, can not, forget it, more...

Opposite:
allowed, permitted, authorized, sanctioned

Phrases:
they must not be lax at lax, must not be beheld, thing which must not be questioned, one who must not be named, more...

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Similar:
may not, mustn't, can't, cannot, need not, taboo, shouldn't, don't, can not, forget it, more...

Opposite:
allowed, permitted, authorized, sanctioned

Phrases:
they must not be lax at lax, must not be beheld, thing which must not be questioned, one who must not be named, more...



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