Learn the tone, meaning, and better English alternatives around "she must be" with real scene examples.

It means the speaker strongly rejects the idea and says they will not stay in place.
From On One Condition, Episode 2
The speaker is saying someone is joking if they think they will stay where they are.
Use this when refusing a demand or expectation in a heated conversation. It can sound sharp or defiant, so it may come across as rude.
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