- phrasal verb to make something fall off by hitting it
- phrasal verb to reduce the price of something by an amount
- phrasal verb to reduce a price by a particular amount
- noun a cheap copy of an established product, often an illegal copy of a famous named brand
- phrasal verb to stop work
- verb to kill
- verb to steal or rob
- verb to have sex with, succeed in seducing. In American English to ‘knock off a piece’ is a depersonalising description of a sexual conquest.