concussion
/kənˈkʌʃən/noun
1
- mass noun temporary unconsciousness caused by a blow on the head. The term is also used loosely of the after-effects such as confusion or temporary incapacity.（头部被击导致的）暂时知觉丧失; 脑震荡。
2
- a violent shock as from a heavy blow猛击; 剧烈震动; 震荡：
the ground shuddered with the concussion of the blast.
地面由于爆炸的冲击而震动。
词源
late Middle English: from Latin concussio（n-）， from the verb concutere 'dash together， shake' （see CONCUSS）.