con·cuss 
(kən-kŭs)
(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 the Appendix of Indo-European roots.]