1. Concuss (third-person singular simple present Concusses, present participle Concussing, simple past and past participle Concussed) To injure the brain of, usually temporarily, by violent impact

2. Concuss (third-person singular simple present Concusses, present participle concussing, simple past and past participle concussed) (transitive) To injure the brain of, usually temporarily, by violent impact