1. (

• knock ,
• knocking

) the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder" ;

2. (

• knock ,
• roast

) negative criticism ;

3. (

• knock ,
• bash ,
• bang ,
• smash ,
• belt

) a vigorous blow; "the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head" ;

4. (

• knock ,

) a bad experience; "the school of hard knocks" ;

5. (

• knock ,
• belt ,
• rap ,
• whack ,
• whang

) the act of hitting vigorously; "he gave the table a whack" ;

1. (

• knock ,
• strike_hard

) deliver a sharp blow or push; "He knocked the glass clear across the room" ;

2. (

• knock ,

) rap with the knuckles; "knock on the door" ;

3. (

• bump ,
• knock

) knock against with force or violence; "My car bumped into the tree" ;

4. (

• tap ,
• rap ,
• knock ,
• pink

) make light, repeated taps on a surface; "he was tapping his fingers on the table impatiently" ;

5. (

• pink ,
• ping ,
• knock ,

) 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. (

• knock ,
• criticize ,
• criticise ,
• pick_apart

) find fault with; express criticism of; point out real or perceived flaws; "The paper criticized the new movie"; "Don't knock the food;