knock的过去式

1. 敲，击，撞，碰，打
2. 击（撞）成…，敲出
3. 批评，贬损
4. 敲掉，去掉，打掉
5. 使碰撞，撞倒，凿打
6. 使震惊，给...强烈印象
7. 去除，祛除(疾病)
8. 找岔子，吹毛求疵，非难，批评， 数落
9. 相撞，碰击，碰撞
10. 发出爆击声，发爆震声，发碰撞声，嘭嘭作响
11. 怦怦跳
12. 打哆嗦
13. 说坏话
14. 奔忙

1. 敲，击，打
2. 敲门声，爆震声
3. 不幸，打击，挫折，艰苦，困苦
4. 指摘，挑剔，吹毛求疵，找碴儿
5. 盘，局，回合

1. the sound of knocking (as on a door or in an engine or bearing);

   "the knocking grew louder"
   

2. negative criticism
3. a vigorous blow;

   "the sudden knock floored him"
   "he took a bash right in his face"
   "he got a bang on the head"
   

4. a bad experience;

   "the school of hard knocks"
   

5. the act of hitting vigorously;

   "he gave the table a whack"
   

1. deliver a sharp blow or push :

   "He knocked the glass clear across the room"
   

2. rap with the knuckles;

   "knock on the door"
   

3. knock against with force or violence;

   "My car bumped into the tree"
   

4. make light, repeated taps on a surface;

   "he was tapping his fingers on the table impatiently"
   

5. sound like a car engine that is firing too early;

   "the car pinged when I put in low-octane gasoline"
   "The car pinked when the ignition was too far retarded"
   

6. find fault with; express criticism of; point out real or perceived flaws;

   "The paper criticized the new movie"
   "Don't knock the food--it's free"
   

1. knock的反义词

1. 敲缸：辛烷值是用来表示燃料发生敲缸(Knock)倾向,也就是发生自燃(Autoignition)倾向的指标. 人为地把异辛烷(isooctane)的辛烷值定为100,把正庚烷(n-heptane)的辛烷值定为零,在标准的火花点火试验机上试验,

2. knock

2. 敲击：热控制阀(Heat-Control Valve) 在引擎排气歧管中一种节温操作阀门,可在引擎未达正常工作温度之前,将废气的热导入进气歧管. 敲击(Knock) 随引擎速度出现的金属撞击声,通常是因轴承松脱或磨损所产生. 主轴承(Main Bearing) 引擎内支撑曲轴的轴承.

• get the knock被解雇,遭到失败
• hear a knock听到敲门声
• receive a knock受到挫折
• stand the knock忍受指责
• take a knock受到严重损失

• gentle knock轻轻的敲门声
• loud knock重重的敲门声
• good knock打一局好球
• first knock第一局球
• bad knock损失不少钱财
• damaging knock破坏性的挫折
• hard knock沉重的打击

• engine knock发动机的爆震声

• knock a ball拍球
• knock colds消除感冒
• knock head撞头
• knock sb's hometown抨击某人的家乡
• knock sb's play抨击某人的戏剧
• knock such notions给人以深刻的观念
• knock the ash敲烟灰
• knock the bottom of the box敲箱子底
• knock the dust敲打灰尘
• knock the England team挖苦英格兰队
• knock the foreign policy抨击外交
• knock the furniture碰倒家具
• knock the glass打破玻璃
• knock the nail钉钉子
• knock the price降价
• knock the wall拆墙
• knock the worry摆脱忧愁

• knock badly剧烈撞击
• knock loudly发出大声地碰撞
• knock about〔around〕流浪
• knock down撞倒,拆除,挣(钱)
• knock down a machine把机器拆卸开来
• knock down a plane击落飞机
• knock down an A in history历史考得优等分数
• knock down good money挣很多钱
• knock down some cash偷一些现金
• knock off停止工作,完成,结束,快速写
• knock off a few lines匆匆写几句
• knock off work歇工
• knock out击倒,使昏迷或入睡,彻底击败
• knock out the enemy guards干掉敌人哨兵
• knock oneself out to get through the difficulty竭尽全力渡过困难
• knock oneself out preparing for the experiment努力为实验做好准备
• knock oneself out with excessive work过度工作而筋疲力尽
• knock over打翻,轻易击败
• knock over a lamp打翻一盏灯
• knock up击打,草率或匆忙地作出
• knock up a meal匆匆做好一餐饭

• knock against偶然碰到
• knock at a door敲门
• knock into将…击打进或撞进,偶然碰到
• knock into the old teacher偶然碰到那位老教师
• knock sb off sb's feet把某人在地
• knock on the door敲门
• knock sb on the head打某人的头
• knock sth on the head破坏某事
• knock sth to pieces把某物打碎
• knock with a bat用球拍打

• The knock at the door startled Merdelius.

  出自：M. West

• She..gave the prearranged knock on the door.

  出自：R. Ingalls

• He took a bad ankle knock..and it is very swollen.

  出自：Press Journal (Aberdeen)

• What's he that knocks as he would beat down the gate?

  出自：Taming of Shrew,Shakespeare

• If you knocked at every house You wouldn't find a man who could recognise a louse.

  出自：M. Baldwin

• He knocked on the inner door.

  出自：D. Adams

• How tempted I would have been to yield, if opportunity had only knocked.

  出自：fig.

1. knock用作名词的基本意思是“狠狠的一击,打击”,用于比喻可指“不幸,挫折,艰苦”,引申可指“敲击声,敲击信号”。
2. knock是抽象名词,但却可数,可加不定冠词修饰,也可用复数形式,表示复数概念。
3. knock后接at〔to〕的介词短语表示侧重敲击的对象; 接on的介词短语侧重敲击的位置。

1. knock的基本意思是用手、拳等硬物“敲打”,指出声地、连续地猛击,引申可指发出敲击或爆裂的声响。还可表示“批评”“数落”“非难”。
2. knock可用作及物动词,也可用作不及物动词。用作及物动词时,可接名词或代词宾语,也可接以形容词充当补足语的复合宾语。可用于被动结构。
3. knock是瞬间动词,如表示重复动作,须用进行体。