Synonym: bang, beat, hammer, hit, jab, pound, punch, rap, strike. Similar words: knock out, knock off, knock down, know, on occasion, sock, dock, know about. Meaning: [nɑk /nɒk] 
n. 1. the sound of knocking (as on a door or in an engine or bearing) 2. negative criticism 3. a vigorous blow 4. a bad experience 5. the act of hitting vigorously. v. 1. deliver a sharp blow or push :"He knocked the glass clear across the room" 2. rap with the knuckles 3. knock against with force or violence 4. make light, repeated taps on a surface 5. sound like a car engine that is firing too early 6. find fault with; express criticism of; point out real or perceived flaws.
n. 1. the sound of knocking (as on a door or in an engine or bearing) 2. negative criticism 3. a vigorous blow 4. a bad experience 5. the act of hitting vigorously. v. 1. deliver a sharp blow or push :"He knocked the glass clear across the room" 2. rap with the knuckles 3. knock against with force or violence 4. make light, repeated taps on a surface 5. sound like a car engine that is firing too early 6. find fault with; express criticism of; point out real or perceived flaws. 
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(91) Knock it off, kids, I'm trying to sleep!
(92) There was a knock at/on the door.
(93) How much can you knock down a year?
(94) What time do you knock off?
(95) There was a sharp knock on the door.
(96) She took a bad knock when her husband died.
(97) He diagnosed the trouble that caused the engine knock.
(98) 'Plastics?' 'Don't knock it-there's a great future in plastics.'
(99) Don't knock yourself up trying to finish the job.
(100) How much did that new watch knock you back?
(101) They managed to knock a hole in the wall.
(102) You should knock their silly heads together.
(103) With that dress and your new haircut, you'll knock him dead.
(104) You've been whistling that same tune all morning. Knock it off, will you?
(105) We should be able to knock something together with what's in the fridge .
(106) Knock the ash out of your pipe before you refill it.
(107) What time do you want me to knock you up in the morning?
(108) It took him just two weeks to knock the new recruits into shape.
(109) There was a knock at the door. Now Jan knew her mother had promised to visit, so she assumed it was her.
(110) She got a nasty knock on the head when she fell.
(111) She does not want to knock down his self - esteem .
(112) They want to knock the house down and rebuild it.
(113) We'll have more space if we knock down the adjoining wall .
(114) They had to knock the door down to get in.
(115) Moving quickly from behind the criminal, the policeman was able to knock his gun away.
(116) When we stop enjoying ourselves we'll knock it on the head.
(117) She's asking for ￡150 but I'll try to knock her down to ￡100.
(118) Please knock before entering.
(119) I was awoken from my dream by a knock at the door.
(120) Her confidence took a further knock when she lost her job.
More similar words: knock out, knock off, knock down, know, on occasion, sock, dock, know about, well known, well-known, shock, block, stock, hockey, rocket, cocked, acknowledge.