Learn what "tell me something i don't know" means, when people say it, and how to use it naturally in English.

This is a sarcastic way to say that the other person has not told you anything useful or new.
From The Escaping Mistress, Episode 36
The speaker reacts with irony to something obvious or already known.
Use it jokingly or sarcastically when someone states the obvious. It can sound rude in a serious conversation.
Scenes unlock real expressions as you watch
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