Learn what "you think i don't know that" means, when people say it, and how to use it naturally in English.

It means the speaker believes the other person is pretending ignorance or hiding the truth.
From A Love Once Betrayed, Episode 4
A speaker reacts as if the other person is pretending not to know something obvious.
Use this in an argument when challenging someone’s denial or dishonesty. It can sound accusatory and sharp.
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