knock
Third Person
knocks
Present Participle
knocking
Past Tense
knocked
Past Participle
knocked
1
to hit a door, surface, etc. in a way to attract attention, especially expecting it to be opened
- She had to knock on the door to announce her arrival.
- The neighbor decided to knock on the door to return the borrowed sugar.
- In the middle of the night, a mysterious sound made her nervous, so she cautiously knocked on her roommate's door.
- Before entering the office, it's polite to knock on the door to ensure you're not interrupting a meeting.
- The friend didn't have a phone, so she had to knock on the window to get the homeowner's attention.
2
to hit or strike with force, often accidentally
transitive
- The child knocked his knee against the edge of the coffee table.
- She knocked her head on the low ceiling while going up the stairs.
- He knocked his elbow against the doorframe while rushing out of the room.
- He knocked his head on the low doorway while entering the room.
Synonyms:
3
to hit an object with enough intensity to cause it to shift or topple
transitive
- He knocked the glass off the table accidentally.
- She knocked the book off the shelf while reaching for another.
- The cat knocked the vase off the counter while playing.
- The cat knocked the vase off the shelf while playing.
4
to strike something with force, resulting in a sharp, audible sound
transitive
- She knocked the nail into the wall with a hammer.
- The boxer knocked his opponent out of the ring with a powerful punch.
- He knocked the ball out of the park with his swing.
- The carpenter knocked the wooden plank into place.
Synonyms:
5
to express disapproval or point out shortcomings in someone or something
transitive
- The film critic knocked the movie for its lack of character development.
- She always seems to knock his choice of clothes, no matter what he wears.
- The teacher knocked the student's essay for its lack of structure and clarity.
- It's easy to knock his artwork, but you have to appreciate his unique style.
- The journalist knocked the politician's speech as being vague and lacking substance.
Synonyms:
Antonyms:
6
(of an engine) produce a sharp, metallic noise caused by the premature or uneven ignition of the air-fuel mixture
- The engine started to knock loudly after using low-quality fuel.
- Driving uphill with a heavy load can cause the engine to knock if not properly tuned.
- High levels of carbon deposits in the cylinders can cause the engine to knock.
- The turbocharger malfunctioned, causing the engine to knock under load.