What does it mean?
Hello guys. Who can explain what does it mean? "Im onto you"
This is from Fight club movie then Edward Norton caught Helena Bonham Carter and said her: "Im onto you"
And where this usually use?

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Это значит "раскусить" и знать, что человек намеревается совершить.

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I'm onto you means I will watch your every move or I'm gonna find out what you are up to.