詞彙精選：knock的用法和辨析
一、詳細釋義：
n.
爆震聲
例句：
What's that knock I can hear from the engine?
我聽到發動機有爆震聲是怎麼回事啊?
敲；敲打 [C]
例句：
A sudden knock at the door drew us up sharply in our conversation.
一陣突然的敲門聲使我們停止了談話。
例句：
I heard a knock at the door.
我聽到了敲門聲。
v.
敲；打；擊 [I,T]
例句：
Knock that nail in, it's sticking out dangerously.
把那釘子敲進去，它伸出來很危險。
例句：
If I see that kid in my orchard again, I'll knock his head off.
我要是再看到那個小孩到我的果園裏來，我就揍他。
批評 [T]
例句：
Why must you knock your hometown instead of boosting it?
你爲什麼一定要批評你的家鄉而不爲之吹噓?
例句：
Tom's supervisor has kept knocking him 3 days for the failure of financial plan.
由於財務計劃失敗，湯姆的上司已經數落他三天了。
撞 [I,T]
例句：
The truck was out of control and knocked a dog to death.
失控的卡車將一隻小狗撞死了。
例句：
The baby was knocked from his father's arms.
嬰兒被從他父親的懷中撞落。
（心）怦怦跳 [T]
例句：
After a long marathon running,my heart is knocking rapidly.
一場長距離馬拉松跑下來，我的心臟怦怦直跳。
二、詞義辨析：
knock,tap,rap,pat
這些動詞均有“敲、擊”之意。knock指用拳頭或其它器械猛敲或猛打；也指用手輕敲某物。tap多指慢慢地連續地輕擊或輕拍。rap指用手指或木棒等快速地輕敲或急拍。pat指用手輕拍以示同情、贊同或愛撫。
三、相關短語：
knock about
碰撞;到處流浪,廝混;漫遊;接連打擊;衝擊;粗暴對待
knock against
偶然遇到,碰到
knock back
喝光,花光,花費
knock down
擊倒;撞倒;擊落;使屈服;拆除;拆卸;迫使降低;獲得
knock off
v.1.撞倒，打掉2.減去3.停止，歇工
knock out
v. 1.用錘等敲掉；打掉 2.使昏迷 3.擊倒 4.淘汰 5.使不能使用；毀壞 6.使筋疲力盡；使竭盡全力 7.粗略地〔匆匆地〕創作〔完成〕 8.使震驚 9.引起共鳴
knock over
v.1.碰翻；打倒 2.使吃驚 3.輕易擊敗 4.偷竊；搶劫 5.快速完成
knock up
敲門叫醒；傷害，使煩惱，使生病；掙到，賺到；趕做，趕製
knock cold
［口］打昏； 使昏倒
knock on
敲擊, 結束
knock-on effect
n. 撞擊作用
四、參考例句：
Knock off every objection.
排除一切反對意見。
Knock before you enter.
進來前先敲門。
Knock at the door.
敲門。
Knock it off.
別說了。
Knock yourself out.
請隨意別客氣。
Come in, do not knock.
進來，不要敲門。
Knock out holiday gift shopping.
淘節日禮物。
Someone is knocking at the door.
有人在敲門。
You should knock before you came in.
進來前你應該先敲門。
I heard a knock at the door.
我聽到了敲門聲。
