1. to strike with a hard blow.
2. to affect in a specified way by striking hard: knocked the mugger senseless.
3. to cause to collide: I knocked my head on a low beam.
4. to produce by hitting or striking: knocked a hole in the wall.
5. to instill with or as if with blows: we tried to knock some sense into his head.
6. slang to find fault with; criticize: don't knock the food; it's free.
7. to strike a sharp audible blow or series of blows, as on a door.
8. to collide with something: knocked into the table.
9. to make a pounding or clanking noise: the car engine is knocking.
10. an instance of striking or colliding; a blow.
11. the sound of a sharp tap on a hard surface; a rap.
12. A pounding or clanking noise made by an engine, often as a result of faulty fuel combustion. also called ping1.
13. slang A cutting, often petty criticism.
14. around informal to be rough or brutal with; maltreat.
15. around informal to wander from place to place: knocking around europe.
16. around informal to discuss or consider: met to knock around some ideas.
17. knock back informal to gulp (an alcoholic drink).
18. knock down to bring to the ground with a blow; topple.
19. knock down to disassemble into parts, as for storage or shipping.
20. knock down to declare sold at an auction, as by striking a blow with a gavel.
21. knock down informal to reduce, as in price: knocked each radio down 20 percent.
22. knock down slang to receive as wages; earn: knocks down $50 an hour.
23. knock off to take a break or rest from; stop: knocked off work at noon.
24. knock off to cease work: it's after five; let's knock off.
25. knock off informal to complete, accomplish, or dispose of hastily or easily; finish: that author knocks off a book a year.
26. knock off informal to get rid of; eliminate: knocked off 12 pounds in a month.
27. knock off slang to kill or overcome.
28. knock off slang to hold up or rob: knocked off a bank.
29. knock off informal to copy or imitate, especially without permission: knocking off someone else's ideas.
30. knock out to render unconscious.
31. knock out sports to defeat (a boxing opponent) by a knockout.
32. knock out to render useless or inoperative: the storm knocked out the phones.
33. knock out informal to exert or exhaust (oneself or another) to the utmost: knocked herself out to be ready on time.
34. knock out informal to produce in abundance: the workers knocked out 500 parts in one hour.
35. knock out to inactivate or remove (a gene) by genetic engineering.
36. knock together to make or assemble quickly or carelessly.
37. knock up slang to make pregnant.
38. knock up chiefly british to wake up or summon, as by knocking at the door.
39. knock up chiefly british to wear out; exhaust.
40. have it knocked slang to be certain of success: "he knew he had it knocked after he saw a rough cut of chinatown” ( time).
41. knock cold to render unconscious; knock out.
42. knock dead to kill with a blow.
43. knock dead slang to affect strongly and positively: a performance that knocked the audience dead.
44. knock it off slang quit it. often used in the imperative: knock it off! I'm trying to sleep.
45. knock (oneself) out to make a great effort; exhaust oneself.
46. knock out of the box baseball to force the removal of (an opposing pitcher) by heavy hitting.
47. the slang to overwhelm or amaze.

1. an abrupt rapping sound, as from an impact of a hard object against wood
2. an impact.
3. criticism
4. a batsman's innings.
5. Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition or the characteristic knocking sound associated with it.
6. to rap one's knuckles against something, especially wood.
7. to bump or impact.
8. to denigrate, undervalue.
9. to pass, kick a ball towards another player.

1. A blow; a stroke with something hard or heavy; a jar.
2. A stroke, as on a door for admittance; a rap.
3. to drive or be driven against something; to strike against something; to clash.
4. to strike or beat with something hard or heavy; to rap
5. to practice evil speaking or fault-finding; to criticize habitually or captiously.
6. to strike with something hard or heavy; to move by striking; to drive (a thing) against something
7. to strike for admittance; to rap upon, as a door.
8. to impress strongly or forcibly; to astonish; to move to admiration or applause.
9. to criticise; to find fault with; to disparage.

1. to strike or beat; give a blow or blows to; hit; affect in some way by striking or hitting: as, to knock a ball with a bat; to knock a man senseless; he knocked me down; to knock out one's brains.
2. to use in striking; give a blow or blows with; bring into collision; dash: as, to knock the head against a post.
3. nautical, to lay (a ship) on her side, as a gust or gale.
4. to accomplish hastily; put out of hand.
5. to deduct : as, to knock off ten cents from the price. [colloq.l
6. in bookbinding, to make even the edges of, as a quantity of printed sheets, by striking them on a table while held loosely upright in the hands.
7. to construct hastily, as by nailing.
8. to strike a blow with the fist or with something hard or heavy; specifically, to rap upon a door or gate, as with the knuckles or a knocker, in order to attract the attention of those within.
9. to move or be moved so as to come in collision with something; strike; clash: as, one heavy body knocks against another; his knees knocked together from fright.
10. to smite upon the breast, as in penitence.
11. to die.
12. to speak ill of one.
13. see the extract.
14. to keep up a system of annoying attacks; to keep striking or hitting until the other side capitulates or buys the ‘knocker’ off.
15. A blow; a buffet; a stroke with the fist, or with anything hard or heavy, as a cudgel, a hammer, or the knocker of a door.
16. A clock.

1. deliver a sharp blow or push :
2. negative criticism
3. rap with the knuckles
4. a vigorous blow
5. sound like a car engine that is firing too early
6. the act of hitting vigorously
7. the sound of knocking (as on a door or in an engine or bearing)
8. knock against with force or violence
9. find fault with; express criticism of; point out real or perceived flaws
10. a bad experience
11. make light, repeated taps on a surface