A concussion is a violent blow, especially to the head, that often injures the brain or causes a loss of consciousness — an all-too-frequent occurrence, unfortunately, in contact sports like football or boxing.

First used around 1400, concussion originates from the Latin concussionem, which means "a shaking." Your brain certainly gets "a shaking" when you take a heavy blow to the head, which sometimes causes injury or permanent damage. It's not just people, though, who get concussions; a building can also suffer from a concussion during an earthquake.

Definitions of concussion
  1. noun
    injury to the brain caused by a blow; usually resulting in loss of consciousness
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    type of:
    accidental injury, injury
    an accident that results in physical damage or hurt
  2. noun
    any violent blow
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    type of:
    blow, bump
    an impact (as from a collision)
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