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

This usually means the speaker thinks the listener already knows the person being referenced.
From The Dumb Billionaire Heiress In Love Part Ii, Episode 12
Someone hints that the other person already knows who is being talked about.
Use it in casual speech or arguments when the identity is obvious from context. By itself, it can sound vague or evasive.
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