Definition of black out phrasal verb from the Oxford Advanced Learner's Dictionary

 

black out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to become unconscious for a short time synonym faint The driver had probably blacked out at the wheel. related noun blackout
  1. 1to make a place dark by turning off lights, covering windows, etc. A power failure blacked out the city last night. a house with blacked out windows related noun blackout
  2. 2to prevent something such as a piece of writing or a television broadcast from being read or seen Some lines of the document have been blacked out for security reasons.
See the Oxford Advanced American Dictionary entry: black out