To cause to collide: I knocked my head on a low beam.
To produce by hitting or striking: knocked a hole in the wall.
To instill with or as if with blows: We tried to knock some sense into his head.
Slang To find fault with; criticize: Don't knock the food; it's free.
To strike a sharp audible blow or series of blows, as on a door.
To collide with something: knocked into the table.
To make a pounding or clanking noise: The car engine is knocking.
An instance of striking or colliding; a blow.
The sound of a sharp tap on a hard surface; a rap.
A pounding or clanking noise made by an engine, often as a result of faulty fuel combustion. Also called ping1.
Slang A cutting, often petty criticism.
around Informal To be rough or brutal with; maltreat.
around Informal To wander from place to place: knocking around Europe.
around Informal To discuss or consider: met to knock around some ideas.
knock back Informal To gulp (an alcoholic drink).
knock down To bring to the ground with a blow; topple.
knock down To disassemble into parts, as for storage or shipping.
knock down To declare sold at an auction, as by striking a blow with a gavel.
knock down Informal To reduce, as in price: knocked each radio down 20 percent.
knock down Slang To receive as wages; earn: knocks down $50 an hour.
knock off To take a break or rest from; stop: knocked off work at noon.
knock off To cease work: It's after five; let's knock off.
knock off Informal To complete, accomplish, or dispose of hastily or easily; finish: That author knocks off a book a year.