From Longman Dictionary of Contemporary Englishblack out phrasal verb1 MIto become unconscious SYN faint, pass out For a few seconds, he thought he was going to black out.2 TCNMARK black something ↔ out to put a dark mark over something so that it cannot be seen The censors had blacked out several words.3 PMLIGHT black something ↔ out to hide or turn off all the lights in a town or city, especially during war → blackout → black→ See Verb table
