Concussion
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
In civil 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.
Heinec. Lee. Elm. § 1071.