verb

 

make noise to make a noise by hitting something, especially a door, with your closed hand in order to attract someone's attention

There's someone knocking at/on the door.

 

hit to hit something or someone and make them move or fall down

 

criticize to criticize someone or something, often unfairly

She knocks every suggestion I make.

 

noun

 

noise a sudden short noise made when something or someone hits a surface

a knock at/on the door

 

hit when someone or something is hit, sometimes causing damage or injury

a knock on the head