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Civil law. The unlawful forcing of another by threats of violence to give something of value. It differs from robbery in that in robbery the thing is taken by force, while in concussion it is obtained by threatened violence. Extortion; compulsion by threats and without force

 - n. A shaking or agitation; a shock; caused by the collision of two bodies.

 - (Med.) A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow; as, a concussion of the brain.

 - (Civil Law) The unlawful forcing of another by threats of violence to yield up something of value.

 - Concussion fuse (Mil.), one that is ignited by the concussion of the shell when it strikes.

Syn. - See Shock.

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