Tra từ knock - Từ điển Oxford Advanced Learner 8th

knock [knock knocks knocked knocking] verb, noun BrE [nɒk] NAmE [nɑːk]
verb

AT DOOR/WINDOW
1. intransitive to hit a door, etc. firmly in order to attract attention
Syn: ↑rap
• He knocked three times and waited.
•~ at/on sth Somebody was knocking on the window.

HIT
2. transitive, intransitive to hit sth, often by accident, with a short, hard blow
•~ sth (against/on sth) Be careful you don't knock your head on this low beam.
•~ against/on sth Her hand knocked against the glass.
3. transitive to put sb/sth into a particular state by hitting them/it
•~ sb/sth + adj. The blow knocked me flat.
• He was knocked senseless by the blow.
•~ sb/sth doing sth She knocked my drink flying.
•~ sb/sth + adv./prep. The two rooms had been knocked into one (= the wall between them had been knocked down).
4. transitive to hit sth so that it moves or breaks
•~ sth + adv./prep. He'd knocked over a glass of water.
• I knocked the nail into the wall.
•They had to knock the door down to get in.
•The boys were knocking (= kicking) a ball around in the back yard.
•~ sth (figurative)The criticism had knocked (= damaged) her self-esteem.
5. transitive ~ sth + adv./prep. to make a hole in sth by hitting it hard
•They managed to knock a hole in the wall.

OF HEART/KNEES
6. intransitive if your heart knocks, it beats hard; if your knees knock, they shake, for example from fear
•My heart was knocking wildly.

OF ENGINE/PIPES
7. intransitive to make a regular sound of metal hitting metal, especially because there is sth wrong

CRITICIZE
8. transitive ~ sb/sth (informal)to criticize sb/sth, especially when it happens unfairly
•The newspapers are always knocking the England team.
•‘E-books?’ ‘ Don't knock it — there's a great future in e-books.’
more at beat/knock the (living) daylights out of sb at ↑daylights, bang/knock your/their heads together at ↑head _n., knock hell out of sb/sth at ↑hell, knock/talk some sense into sb at ↑sense _n., get/knock/lick sb into shapeget/knock/lick sth into shape at ↑shape _n., hit/knock sb for six at ↑six, blow/knock sb's socks off at ↑sock _n.
Verb forms:

Word Origin:
Old English cnocian, of imitative origin.

Thesaurus:
knock verb
1. I
•He knocked on the window to get my attention.
rap • • tap • • drum •
knock/rap/tap at sth
knock/rap/tap/drum on/with sth
knock/rap loudly
2. T
•The blow knocked him senseless.
hit • • bang • • bump • |informal bash • |formal strike •
knock/hit/bang/bump/bash against sb/sth
knock/bang/bump/bash into sb/sth

Synonyms:
hit
knock • bang • strike • bump • bash
These words all mean to come against sth with a lot of force.
hit • to come against sth with force, especially causing damage or injury: ▪ The boy was hit by a speeding car.
knock • to hit sth so that it moves or breaks; to put sb/sth into a particular state or position by hitting them/it: ▪ Someone had knocked a hole in the wall.
bang • to hit sth in a way that makes a loud noise: ▪ The baby was banging the table with his spoon.
strike • (formal) to hit sb/sth hard: ▪ The ship struck a rock.
bump • to hit sb/sth accidentally: ▪ In the darkness I bumped into a chair.
bash • (informal) to hit against sth very hard: ▪ I braked too late, bashing into the car in front.
to hit/knock/bang/bump/bash against sb/sth
to knock/bang/bump/bash into sb/sth
to hit/strike the ground/floor/wall

Example Bank:
•Dobson walked straight into her office without knocking.
•He had knocked one of the pictures off the wall.
•He was knocked flying as two policemen came crashing through the door.
•Her boyfriend had been knocking her about.
•I accidentally knocked the vase off the table.
•I knocked my head on one of the beams.
•Mind you don't knock that glass over.
•She knocked timidly on the study door and entered.
•Someone knocked loudly at the door.
•The blow knocked him unconscious.
•The explosion knocked him off his feet.
•The stick knocked against the wall.
•I accidentally knocked over his drink.
•Someone had knocked a hole in the wall.
•The door's very low— mind you don't knock your head!
•The two rooms had been knocked into one.
•They had to knock the door down to get into the apartment.
Idioms: ↑I'll knock your head off! ▪ ↑knock it off! ▪ ↑knock on wood ▪ ↑knock somebody dead ▪ ↑knock somebody into a cocked hat ▪ ↑knock somebody off their perch ▪ ↑knock somebody sideways ▪ ↑knock something on the head ▪ ↑knock spots off somebody ▪ ↑knock the stuffing out of somebody ▪ ↑take a knock ▪ ↑you could have knocked me down with a feather
Derived: ↑knock around with somebody ▪ ↑knock around … ▪ ↑knock off ▪ ↑knock off something ▪ ↑knock somebody around ▪ ↑knock somebody back ▪ ↑knock somebody back something ▪ ↑knock somebody down ▪ ↑knock somebody off ▪ ↑knock somebody out ▪ ↑knock somebody over ▪ ↑knock somebody up ▪ ↑knock something back ▪ ↑knock something down ▪ ↑knock something off ▪ ↑knock something off something ▪ ↑knock something out ▪ ↑knock something together ▪ ↑knock something up ▪ ↑knock up

noun

AT DOOR/WINDOW
1. the sound of sb hitting a door, window, etc. with their hand or with sth hard to attract attention
•There was a knock on/at the door.

HIT
2. a sharp blow from sth hard
Syn: ↑bang
• He got a nasty knock on the head.
• Knocks and scratches will lower the value of valuable furniture.

Word Origin:
Old English cnocian, of imitative origin.

Example Bank:
•Their pride took quite a knock when they lost 5–0.
•There was a loud knock at the door.
•You've had a nasty knock on the head.
•the hard knocks of life
•Her confidence took a knock when she lost her job.
•Knocks and scratches will lower the value of antique furniture.

See also: ↑knock about with somebody ▪ ↑knock about … ▪ ↑knock somebody about ▪ ↑touch wood