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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
Examples
She had to knock on the door to announce her arrival.
02
to hit or strike with force, often accidentally
Transitive: to knock sth against | to knock sth on sth
Examples
The child knocked his knee against the edge of the coffee table.
03
to hit an object with enough intensity to cause it to shift or topple
Transitive: to knock sth somewhere
Examples
He knocked the glass off the table accidentally.
04
to strike something with force, resulting in a sharp, audible sound
Transitive: to knock sb/sth somewhere
Examples
She knocked the nail into the wall with a hammer.
05
to express disapproval or point out shortcomings in someone or something
Transitive: to knock sth
Examples
The film critic knocked the movie for its lack of character development.
06
(of an engine) produce a sharp, metallic noise caused by the premature or uneven ignition of the air-fuel mixture
Intransitive
Examples
The engine started to knock loudly after using low-quality fuel.
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
Lexical Tree
knocker
knocking
knock
