A concussion is a type of brain injury caused by a hard blow to the head or body that shakes the brain. It can cause headaches, confusion, memory problems, and other temporary difficulties.
From Latin 'concussiō', from 'concutere' ('to shake violently'), combining 'com-' and 'quatere' ('to shake'). It entered English in the 1500s for violent shaking or shock, especially to the brain.
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