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LIGHT, OUT LIKE A

LIGHT, OUT LIKE A
ScnMaster
(informal) unconscious. NED Approved Glossary
LIGHT, OUT LIKE A
ScnTUEU
in a condition where one has suddenly gone unconscious, fainted or fallen fast asleep, as from a blow on the head, a drug or for some other reason. This phrase probably alludes to the fact that a light is clearly on or off, and when switched into either of these conditions, does so instantly. (informal) unconscious.