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black out
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Quick answer
As a verb, black out means darken completely.
Meanings of black out
3 meaningsverb
Darken completely
“The dining room blackened out”
Similar: blacken outSuppress by censorship as for political reasons
“parts of the newspaper article were blacked out”
Lose consciousness due to a sudden trauma, for examplebody
Similar: zonk out, pass out
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
verb: darken completely
blacken out
verb: lose consciousness due to a sudden trauma, for example
zonk outpass out