Learn what "someone who knows a little too much" means, when people say it, and how to use it naturally in English.

This means the speaker is implying that someone has seen or learned more than they should have.
From Billionaire’s Betrayal, Episode 37
The speaker hints that a certain person has information they know too much about.
Use this in a tense or suspicious situation when you want to imply someone is a risk. It sounds ominous and is not polite for normal conversation.
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