Learn what "don't play dumb" means, when people say it, and how to use it naturally in English.

It means stop pretending to be innocent, because I already saw what you did.
From Billionaire’s Betrayal, Episode 5
Someone accuses another person of pretending not to know the truth after seeing them take something.
Use this in an argument when confronting someone you think is lying or acting innocent. It sounds angry and aggressive, so it can be very rude.
Scenes unlock real expressions as you watch
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