3 verb
black3 [transitive]
1 British EnglishBEL if a trade union blacks goods or a company, it refuses to work with them:
The union has blacked all non-urgent work.
2CC old-fashioned to make something black

black out

phrasal verb
1MI to become unconscious [= faint, pass out]:
For a few seconds, he thought he was going to black out.

black something ↔ out

to put a dark mark over something so that it cannot be seen:
The censors had blacked out several words.

black something ↔ out

to hide or turn off all the lights in a town or city, especially during war
[↪ blackout]

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