词根：cuss = to strike, to shake

  来自拉丁语的cuss 意为to strike,to shake。同义词根有来自拉丁语的bef,flict,fend/fens(fence,fest),lid / lis,plaud/plaus(plod,plos,plex)等和来自盎格鲁-撒克逊语sla。
  （*拉丁文cutere (=to strike,to shake),过去分词是cussus——英文字根字典）

同源词：

1. repercussion （用力摇晃回去 re (=back) + per(=intensive) + cuss(=shake)）
  n.弹回；（事件等的）影响；反响
  The high school shooting had repercussions all over America.高中枪击事件在全美国引起了反响。

2. percussion
  n.冲击;（敲击、撞击产生的）振动；（声音对耳膜的）震动；打击乐器（的演奏）*per(=completely)
  percussionist n.打击乐演奏者
  percussioncap 雷管
  percussion instrument 打击乐器

3. concuss
  v.引起（脑）震荡；震动，猛烈摇动 *con<com(=together)

4. concussion
  n.震动，猛击 *con<com(=together)
  concussion of the brain 脑震荡

5. discuss
  v.讨论；论述 *dis(=away)

6. discussion
  n.讨论；论述 *dis(=away)
  under discussion 正在讨论

7. quash
  v.取消；镇压 （打消）《拉丁文quatere = to shake》

词根：cuss = shake, 表示“摇动”

concussion n. 冲击，震荡（con全部+cuss+ion→全部摇动→震荡）

discuss n. 讨论（dis分散+cuss→分散敲击[问题]→讨论）

percussion n. 撞击，震动（per从头到尾+cuss+ion→一直摇动→震动）

repercussion n. 反响，影响（re一再+percussion→一再引起震动→产生的影响，后果）

词根：custom = habit, 表示“习惯”

customary a. 习惯性的

customer n. 顾客（custom+er人→习惯（进商店的）人→顾客）

accustorn v. 使习惯（ac使+cusrom→使习惯）

词根：custod = guard （看护）

custody v. 监护

词根词缀：acous-, acou-, acouo-, acoustico-, acouto-, acousti-, -acousia, -acousis, -acoustical, acu-, -acusis-, -acusia

【来源及含义】Greek: akoustikos, to hear, hearing; to listen, listening

【相关词根词缀】 Related "hear, hearing; listen, listening" units: audio-; ausculto-.

【同源单词】acouasm, acoubuoy, acouesthesia, acoumeter, acouophone, acouophonia

词根词缀：acuto-, acut-, acuti-, acu-, -cusis; also, agu-

【来源及含义】Latin: sharp, to sharpen, point; needle, pin

【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "sour, sharp": acerb-; aceto-; acid-; acies- (not "sour"); oxy-; pung- (not "sour").

【同源单词】acicula, acicular, acicular ice, aciculate, aciculate, aciculiform

词根词缀：cocco-, cocc-, -coccus, -cocci, -coccal, -cocca

【来源及含义】Greek: bacteria; literally, a "berry, kernel"

【同源单词】coccal, cocci, coccid, coccidiosis, coccidosis, cocciferous

词根词缀：cuspid-

【来源及含义】Latin: point

词根词缀：cuss-

【来源及含义】Latin: from quatere, to shake, to strike, to beat

【同源单词】concuss, concussion, concussion of the brain, concussive, discuss, discusser

词根词缀：custo-, custod-

【来源及含义】Latin: guardian, keeper, protection; guarding, keeping

【同源单词】custodial, custodian, custodianship, custodier, custody, noncustodial