concussion
词根词缀：
词根
cuss= shake 摇动
concussion n. 冲击；震荡
con 加强 + cuss 摇动 + ion 表名词 → 摇动得厉害 → 震荡
discuss v. 讨论
dis 分散 + cuss 摇动 → 分散敲击〔问题〕→ 讨论
percussion n. 震动
per 加强 + cuss 摇动 + ion 表名词 → 猛烈摇动 → 震动
repercussion n. 反响；回响
re 回 + percussion 震动 → 震动回来的余震 → 反响；回响
数据来源：新东方英语词汇速记大全
相关例句：
Concussion's more likely, but it's bad.
脑震荡比较有可能，但情形不太乐观。
Basically he got a concussion and I've got to keep an eye on him.
主要是他受了伤我得照看他。
She's got a concussion and a broken eardrum.
她有点脑震荡，耳膜也破了。
You know, I'm sure it's just the concussion.
知道吗，我想只是脑震荡造成的。
She was in Newcastle infirmary with concussion.
她因脑震荡住进了纽卡斯尔医院。
This is his fourth concussion, Shouldn't somebody get him to stop?
这是他第四次脑震荡了，难道没有人阻止他么？