knock down vs put someone's lights out

To hit or knock (something or someone), intentionally or accidentally, so that it falls. 

To drink fast. 

To disassemble for shipment. 

To reduce the price of. 

To demolish. 

To approve a drinking toast by banging glasses on the table. 

At an auction, to declare (something) sold with a blow from the gavel. 

To cause someone to become unconscious, especially by striking him or her.