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to black out

to black out

46 5.4
To suddenly lose consciousness for a short time
  • phrasal verb
  • /blæk aʊt/
translation icon : desmayarse
  • She felt dizzy and then blacked out for a moment after standing up too quickly.

What if you like snapped your fingers and you blacked out like you could that?

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Examples

Synonyms

to pass out
vsto black out
188 3.7

To faint or lose consciousness suddenly

is sudden and often caused by trauma or shock
to faint
vsto black out
151 3.2

Lose consciousness for a short time

is often from trauma or shock rather than blood flow changes
out like a light
vsto black out
  • Informal
7 7.3

To fall asleep or become unconscious very quickly

is sudden unconsciousness usually from injury or shock not sleep
to zonk out
vsto black out
  • Informal
2 8.3

To fall asleep or pass out very quickly because you are very tired

is sudden unconsciousness typically caused by trauma or shock instead

Antonyms

1.0

To stop sleeping or make someone else stop sleeping

How Conscious

to black out
46 5.4
faint
38 2.7
lightheaded
14 4.4

Surface Forms

black out infinitive
blackout infinitive
blacking out present participle
blacks out third person singular
blackouts third person singular

Morphology

black + out

The censoring meaning is directly derivable from combining 'black' (to darken/obscure) with 'out' (completely/away from view): making text or images black so they are not visible is a literal compositional action. This motion/covering pattern is common and cross-linguistically transparent, so a B1 learner who knows the constituents would likely understand this sense (though the verb also has other senses like losing consciousness).

Etymology

Black out comes from the image of the lights going out in your head so everything goes black when your brain gets less blood or oxygen and you faint. That's why black out means 'to lose consciousness suddenly'.