American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Out like a light

DEFINITION

(Old fashioned) Knocked unconscious. Deeply asleep. A light switch rapidly turns a light off, so this phrase presents a situation that was turned off quickly. (Compare to Out cold.)

“After we came home from the circus, our son had so much fun that when we put him to  bed he went out like a light.”

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