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to knock
01
to hit a door, surface, etc. in a way to attract attention, especially expecting it to be opened
Intransitive: to knock on a surface
02
to hit or strike with force, often accidentally
Transitive: to knock sth against | to knock sth on sth
03
to hit an object with enough intensity to cause it to shift or topple
Transitive: to knock sth somewhere
04
to strike something with force, resulting in a sharp, audible sound
Transitive: to knock sb/sth somewhere
05
to express disapproval or point out shortcomings in someone or something
Transitive: to knock sth
06
(of an engine) produce a sharp, metallic noise caused by the premature or uneven ignition of the air-fuel mixture
Intransitive
Knock
01
the sound of knocking (as on a door or in an engine or bearing)
02
negative criticism
03
the act of hitting vigorously
04
a vigorous blow
05
a bad experience
knock
v
knocker
n
knocker
n
knocking
n
knocking
n
Example
She had to knock on the door to announce her arrival.
The friend didn't have a phone, so she had to knock on the window to get the homeowner's attention.
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.
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