punch lights out

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punch (one's) lights out

To render one unconscious with a punch. A: "Oh man, what happened?" B: "Well, you and Bart were fighting, and then Bart punched your lights out." Wow, you're strong—you could punch someone's lights out no problem!
See also: lights, out, punch

punch someone's lights out

Sl. to knock someone out with a fist. You had better stop that, or I will punch your lights out! Do you want me to punch your lights out?
See also: lights, out, punch