knock (one's) lights out

To render one unconscious with a blow to the head. A: "Oh man, what happened?" B: "You don't remember? Well, you and Bart were fighting, and then Bart knocked your lights out." Wow, you're strong—you could knock someone's lights out, no problem!

See also: knock, lights, out

See also:

knock (one's) brains out
put (one's) lights out
punch (one's) lights out
punch lights out
punch someone's lights out
ring one's chimes
put (one) under
put under
eat my shorts
Eat my shorts!

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