mustn't
MUS-uhnt/ˈmʌs.n̩t/
- 1Used to say that someone is not allowed to do something.
Like a sign that says "Do not enter": it tells you something is not allowed.
You mustn't touch the stove when it's hot.
Look, we mustn't mistake ourselves for regular people. We're artists.
1989Here, mustn't means we are not allowed to, it is something to avoid.Note
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Origin
It comes from "must" plus "-n't," the short form of "not."