Concuss/kənˈkʌs/ Definition 1 of 2Pro Tip 1/3Medical Context Used when talking about brain injuries, often related to sports or accidents. The boxer was concussed after a heavy blow to the head. Pro Tip 2/3Physical Trauma Implies a physical injury, not just a bump or a light hit. She fell off her bike and concussed herself on the pavement. Pro Tip 3/3Serious Condition Signifies a serious condition that requires medical attention. The skier was concussed and needed immediate evaluation by the medical team.