Learn what "do you know" means, when people say it, and how to use it naturally in English.

It means the speaker does not believe the excuse or compliment because it sounds repeated and unconvincing.
From Duty Or Desire, Episode 54
Someone is responding with skepticism because they have heard the same excuse or line many times before.
Use this in an argument when you want to show disbelief or call out a repeated line. It can sound sharp or mocking.
Scenes unlock real expressions as you watch
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