Wiktionary
alt. (non-gloss definition: Used to indicate that something is forbidden.) vb. (non-gloss definition: Used to indicate that something is forbidden.)
Usage examples of "must not".
William of Occam, one of Earth's pioneers in scientific method, established that one must not multiply logical entities without sufficient reason.
But God would become angry if she ever told anyone how she was helping: it said in the scriptures that in acts of charity the right hand must not know what the left hand is doing.
He realised he was playing well and that he must not draw attention to it, but let Harvey take it for granted.
This important jewel was to be delivered to the Klingon government as a token of fealty by one of the powerful Klingon families -- a task at which Warf must not fail.
You must not wait for the months it may take for legislation to be enacted.
Therefore you must not, in every case at least take the higgledy-piggledy whale statements, however authentic, in these extracts, for veritable gospel cetology.
We must not give them reason to say that their neighbors are inquisitive.
In the meantime, with Western help, free Asian political leaders -- together with the military -- must not only hold on and manage, but reform and advance while liquidating the enemy's political and guerrilla armies.