Meaning & Definition of Knock in English

1. The sound of knocking (as on a door or in an engine or bearing)

• "The knocking grew louder"

2. Negative criticism

3. A vigorous blow

• "The sudden knock floored him"

• "He took a bash right in his face"

• "He got a bang on the head"

4. A bad experience

• "The school of hard knocks"

5. The act of hitting vigorously

• "He gave the table a whack"

1. Deliver a sharp blow or push :"he knocked the glass clear across the room"

2. Rap with the knuckles

• "Knock on the door"

3. Knock against with force or violence

• "My car bumped into the tree"

4. Make light, repeated taps on a surface

• "He was tapping his fingers on the table impatiently"

5. Sound like a car engine that is firing too early

• "The car pinged when i put in low-octane gasoline"

• "The car pinked when the ignition was too far retarded"

6. Find fault with

• Express criticism of

• Point out real or perceived flaws

• "The paper criticized the new movie"

• "Don't knock the food--it's free"