Concussion

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CONCUSSION, civ. law. The unlawful forcing of another by threats of violence to give something of value. It differs from robbery in this, that in robbery the thing is taken by force, while in concussion it is obtained by threatened violence. Hein. Lec. El, Sec. 1071

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.