verb
- to hit or strike something, especially a door, to get attention
- to hit something and cause it to move or fall
- to criticize someone or something harshly
Usage: informal
noun
- the sound or act of hitting something, especially a door
- a hard hit or blow
Examples
- Please knock on the door before entering.
- The wind knocked over the trash can.
- She knocked her knee against the table.
- I heard a loud knock at the front door.
- The critics always knock his movies.
- He took a hard knock to the head during the game.
- Don’t knock it until you try it.