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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
02
to hit or strike with force, often accidentally
03
to hit an object with enough intensity to cause it to shift or topple
04
to strike something with force, resulting in a sharp, audible sound
05
to express disapproval or point out shortcomings in someone or something
06
(of an engine) produce a sharp, metallic noise caused by the premature or uneven ignition of the air-fuel mixture
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
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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