What is the term "Has been bought" used for?

I saw it in the movie Eraser (1996). Here are some lines of the transcript:

-John, where are you?
-DeGuerin is the mole. He killed -the others to flush out my witness. -Come in.
-I'll protect my witness!
-You'll put her in danger.
-You'll both end up dead.
-DeGuerin has been bought.
-My witness knows too much.
-Federal agents say you are the shooter.
-I'll call you back.
-When I have proof.


I don't think it is a 'term' as such, I'd take it at face value (as DeGuerin is the 'bad' guy in the movie ) that he has been 'bought' / bribed / palm-oiled / became 'dirty' .

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