1. 動詞
   不及物動詞:
   敲, 敲門
   擊, 打
   相撞, 碰擊
   (心)跳動
   (膝蓋)顫抖
   (管子等)發出碰撞聲
   (機械等由於故障)發爆震聲
   及物動詞:
   敲到...(物)
   

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   同義字詞
   bang,bash,bump,collide,crash,hit,impact,impinge,ram,slam,smash,strike,swipe,thud
   bang,bash,bat,belt,bludgeon,bob,bonk,bop,box,bust,clap,clip,clobber,clock,clout,crack,hammer,hit,nail,paste,pound,punch,rap,slam,slap,slog,slug,smack,smite,sock,strike,swat,swipe,thump,thwack,wallop,whack,whale,zap
   blame,censure,condemn,criticize,denounce,fault,pan,reprehend
   

2. 名詞
   敲, 擊
   打
   挫折, 不幸
   爆震聲
   a knock on/at ...(物體):
   對...的一敲
   對...的一擊
   /以上複數為"knocks"/
   限定單數可數名詞a knock on ...(人事物):
   對...的指摘
   

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   同義字詞
   bang,bash,bat,beat,belt,blow,bop,box,buffet,bust,chop,clap,clip,clout,crack,cuff,dab,fillip,hack,haymaker,hit,hook,lash,lick,pelt,plump,poke,pound,punch,rap,slam,slap,slug,smack,smash,sock,spank,stinger,stripe,stroke,swat,swipe,switch,thud,thump,thwack,wallop,welt,whack,wham,whop,whap
   adversity,ill,misadventure,mischance,misfortune,mishap,tragedy
   lapse,reversal,reverse,setback
   

3. 形容詞
   (爭論、打鬥等)knock-down/
   (爭論、打鬥等)knock-down-drag-out/
   (爭論、打鬥等)knock-down-and-drag-out:
   你死我活的
   殘酷無情的
   激烈的/
   不惜一切手段的
   猛烈的
   knock-knock(必接名詞如笑話、盜竊等):
   敲門式的
   

4. 感嘆詞
   Knock it off:
   別再講下去了!
   別吵了!
   別爭了!
   別鬧了!
   Knock yourself out:
   請便!
   請自便!
   把這當自己家!
   knock knock:
   

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例句

1. A knock at the door.
2. I er go and get a knock !
3. There was knock at the door.
4. She tried to knock his hands away.
5. Just don't knock over the microphone.
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