Concussion
Bouvier's Law Dictionary and Concise Encyclopedia · John Bouvier; revised by Francis Rawle · 1914
Bouvier's Law Dictionary and Concise Encyclopedia
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.
Heineccius, Lee. EL § 1071.