The application to another of either physical or moral
   force. When the force is physical, and cannot be resisted, then the act
   produced by it is a nullity, so far as concerns the party coerced. When
   the force is moral, then the act, though voidable, is imputable to the
   party doing it, unless he be so paralyzed by terror as to act
   convulsively. At the same time coercion is not negatived by the fact of
   submission under force. "Coactus volui" (I consented under compulsion)
   is the condition of mind which, when there is volition forced by
   coercion, annuls the result of such coercion.