v.1. To hit something abruptly and dislodge it or remove it from something else: I accidentally knocked the vase off the shelf as I walked by. Knock off the mud on your shoes before you come in. The low branch knocked my hat off.
2. Slang To take a break or rest: Let's knock off for a few minutes and get something to eat.
3. Slang To stop doing some kind of labor for the day: We knocked off work at noon and went fishing. Let's knock off early today and go out for a drink.
4. Slang To complete, accomplish, or dispose of something hastily or easily; finish something quickly or easily: That author knocks off three books a year. Once we knock the project off, we can eat lunch.
5. Slang To eliminate something; get rid of something: The sales person knocked $50 off the price of the stereo. Knock off 12 pounds in just one month with our exclusive diet plan!
6. Slang To overcome or defeat someone or something: They knocked off the two best teams in the league. They were the better team, but somehow we knocked them off by almost 20 points.
7. Slang To kill someone: The sniper knocked off three of our best soldiers. I was afraid that they would knock me off if I told the police.
8. Slang To rob some place: He went to jail for knocking off a bank.
9. Slang To copy or imitate something, especially without permission: He made a career out of knocking off other peoples ideas. The new car design really just knocks off last year's model.