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Related to fake out: fake off
fake someone out
to deceive someone; to fool someone. You really faked me out. I never would have guessed it was you. The student tried to fake out the teacher.
To fool someone into expecting that you will act in one manner, only to act in another: He faked me out by looking to the right but jumping to the left. The lights came on briefly to fake out the audience, but then they went out and the band returned to the stage.