Definition of 'black out'

Verb

1. obliterate or extinguish; "Some life-forms were obliterated by the radiation, others survived"
2. darken completely; "The dining room blackened out"
      Synonyms: blacken out
3. suppress by censorship as for political reasons; "parts of the newspaper article were blacked out"
4. lose consciousness due to a sudden trauma, for example
      Synonyms: zonk out pass out

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