contraction of must not.

See contraction. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To mustn't
Example sentences
It's seductively clear and you mustn't think about it.
They may know the reasons why they mustn't do this, but then come the next week
  there's no food or the kids are sick.
Yet one mustn't always be a teetotaling bore, either.
But the digital library system mustn't neglect books and other texts.
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