Definitions from Wiktionary (concussion)

▸ noun:  (obsolete, seismology) A violent collision or shock.
▸ noun:  (uncountable in Commonwealth, countable in Canada, US) An injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function.
▸ noun:  (obsolete, law) The unlawful forcing of another by threats of violence to yield up something of value.
▸ Also see concussion

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