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 concussion concussion /kənˈkʌʃən/

noun

  1. () Any violent blow  ( concussion )
    any violent blow
  2. () Injury to the brain caused by a blow; usually resulting in loss of consciousness  ( concussion )
    injury to the brain caused by a blow; usually resulting in loss of consciousness
     The boxer was taken to the hospital with a concussion after being knocked out
    The boxer was taken to the hospital with a concussion after being knocked out