| 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,
|
| 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 (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]