to make a place dark by turning off all the lights, for example so that the enemy cannot see a place at night.
to prevent someone from reading or seeing something by covering it with something dark
to suddenly become unconscious
Half the pages in the report had been blacked out for security reasons.
He had blacked out as his car hit the tree.
Just as he knew he was about to black out, Joab flung him into the cell and slammed the grate shut.
blacks out
blacking out
blacked out
There is no origin for this phrasal verb
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