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English definition of “black sth out”

black sth out

(NO LIGHT) phrasal verb with black     /blæk/ verb [T]
to make a place dark , especially by covering or switching off all the lights : The entire city was blacked out overnight .Darkness and becoming dark → See also blackout
(Definition of black sth out (NO LIGHT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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