Source : Webster's Revised Unabridged Dictionary (1913)

Concuss \Con*cuss"\, v. t. [L. concussus, p. p. of concutere.
   See {Concussion}.]
   1. To shake or agitate. ``Concussed with uncertainty.''
      --Daniel.

   2. (Law) To force (a person) to do something, or give up
      something, by intimidation; to coerce. --Wharton.

Source : WordNet®

concuss
     v 1: shake violently
     2: injure the brain; sustain a concussion