mustn't Definition
must not; do not have permission to.
Using mustn't: Examples
Take a moment to familiarize yourself with how "mustn't" can be used in various situations through the following examples!
Example
You mustn't speak during the exam.
Example
We mustn't forget to lock the door before leaving.
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Summary: mustn't in Brief
'Mustn't' [ˈmʌsnt] is a contraction of 'must not,' indicating that something is prohibited or disallowed. It is often used to give instructions or warnings, such as 'You mustn't speak during the exam.'
