/ kənˈkʌs; NAmE / verb
[ vn ] to hit sb on the head, making them become unconscious or confused for a short time
► con·cussed adjective :
She was concussed after the fall.
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WORD ORIGIN
late 16th cent. (in the sense shake violently ): from Latin concuss- dashed together, violently shaken, from the verb concutere , from con- together + quatere shake.