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Definitions

out like a light

ADJECTIVE
asleep
Synonyms
STRONGEST
comatose dormant
WEAK
catching some zzz's conked crashed dozing dreaming flaked out getting shut-eye hibernating in dreamland in repose inactive inert napping on the kip out out cold out of it reposing resting sacked out sleeping slumbering snoozing snoring somnolent taking forty winks
Antonyms
WEAK
attentive awake conscious
ADJECTIVE
passed out
Synonyms
WEAK
anesthetized asleep blacked out comatose dead to the world knocked out out cold
ADJECTIVE
unawake
Synonyms
WEAK
asleep conked crashed dead to the world dozing dreaming fast inactive inert napping snoozing sound unconscious
ADJECTIVE
unconscious
Synonyms
STRONGEST
comatose paralyzed senseless
STRONG
cold out raving
WEAK
benumbed blacked out bombed dead to the world drowsy entranced feeling no pain flattened in a trance inanimate inert insensate insensible knocked lethargic numb on the canvas palsied passed out put away stunned stupefied swooning torpid tranced zonked
Antonyms
WEAK
awake aware conscious decided intended intentional knowing

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

His team played strongly for the final half hour of the first half but they went out like a light after that.

From BBC • Dec. 14, 2025

That wasn’t a problem for Smith, who said that after he broke down some film, he put on his headphones and earbuds, turned on music and was out like a light.

From Seattle Times • Nov. 10, 2022

We were designed to burn out, like a light bulb that was overamped.

From New York Times • Aug. 9, 2018

I was out like a light the instant I closed my eyes.

From The New Yorker • Jun. 17, 2014

“You were out like a light, boy. Had us all in a sweat.”

From "The Chosen" by Chaim Potok

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.