to injure by concussion: He was mildly concussed by the falling books.
Origin: 1590–1600; < Latin concussus, past participle of concutere, equivalent to con-con- + -cut-, combining form of quat-, stem of quatere to shake + -tus past participle ending
1590s, "to shake violently," from L. concuss-, pp. stem of concutere "to dash together" (see concussion). Meaning "to give a concussion to the brain" is from 1680s. Related: Concussed "violently shaken" (1590s).