| 1. | to strike a sounding blow with the fist, knuckles, or anything hard, esp. on a door, window, or the like, as in seeking admittance, calling attention, or giving a signal: to knock on the door before entering. |
| 2. | to strike in collision; bump: He knocked into a table. |
| 3. | to make a pounding noise: The engine of our car is knocking badly. |
| 4. | Informal. to engage in trivial or carping criticism; find fault. |
| 5. | Cards. to end a game, as in gin rummy, by laying down a hand in which those cards not included in sets total less than a specific amount. |
| 6. | to give a sounding or forcible blow to; hit; strike; beat. |
| 7. | to drive, force, or render by a blow or blows: to knock a man senseless. |
| 8. | to make by striking a blow or blows: to knock a hole in the wall. |
| 9. | to strike (a thing) against something else. |
| 10. | Informal. to criticize, esp. in a carping manner: He's always knocking everything. |
| 11. | British Slang. to astound; impress greatly. |
| 12. | an act or instance of knocking. |
| 13. | the sound of knocking, esp. a rap, as at a door. |
| 14. | a blow or thump. |
| 15. | Informal. an adverse criticism. |
| 16. | the noise resulting from faulty combustion or from incorrect functioning of some part of an internal-combustion engine. |
| 17. | Cricket. an innings. |
| 18. | British Slang.
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| 19. | knock around or about, Informal.
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| 20. | knock back, Slang. to drink (a beverage), esp. quickly and heartily: He knocked back two shots of vodka. |
| 21. | knock down,
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| 22. | knock off,
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| 23. | knock out,
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| 24. | knock over,
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| 25. | knock together, to make or construct in a hurry or with little attention to detail: He knocked together a couple of tables. |
| 26. | knock up,
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| 27. | have it knocked, Slang. to be assured of success: With a government job, he thought he had it knocked. |
| 28. | knock out of the box, Baseball. to cause a pitcher to be removed from the box because the pitcher has permitted too many hits to be made. Also, knock out. |
| 29. | knock the or one's socks off, Informal. to have an overwhelming effect on: The song knocked the socks off the audience. |

knock
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knock (sth)
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knock (sth) off
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"Knocked up in the United States, amongst females, the phrase is equivalent to being enciente, so that Englishmen often unconsciously commit themselves when amongst our Yankee cousins." [John Camden Hotten, "The Slang Dictionary," London, 1860]
Knock
"Though Orientals are very jealous of their privacy, they never knock when about to enter your room, but walk in without warning or ceremony. It is nearly impossible to teach an Arab servant to knock at your door. They give warning at the outer gate either by calling or knocking. To stand and call is a very common and respectful mode. Thus Moses commanded the holder of a pledge to stand without and call to the owner to come forth (Deut. 24:10). This was to avoid the violent intrusion of cruel creditors. Peter stood knocking at the outer door (Acts 12:13, 16), and the three men sent to Joppa by Cornelius made inquiry and 'stood before the gate' (10:17, 18). The idea is that the guard over your privacy is to be placed at the entrance." Knocking is used as a sign of importunity (Matt. 7:7, 8; Luke 13:25), and of the coming of Christ (Luke 12:36; Rev. 3:20).
knock
In addition to the idioms beginning with knock, also see beat (knock) into someone's head; beat (knock) the living daylights out of; (knock) down to size; (knock) off someone's feet; school of hard knocks.