con·cuss (kən-kŭs') tr.v.
con·cussed, con·cuss·ing, con·cuss·es To injure by concussion: "a middle-aged woman concussed by a blow on the head"(Manchester Guardian Weekly).
[Latin concutere, concuss-, to strike together : com-, com- + quatere, to strike; see kwēt- in Indo-European roots.]