From Longman Dictionary of Contemporary Englishknock off phrasal verb informal1 stop workSTOP DOING something knock off (something) to stop working and go somewhere else There was no one in the office because they’d all knocked off for lunch. Do you want to knock off early today? We usually knock off work at about twelve on Saturday.2 reduce a price knock something ↔ offREDUCE to reduce the price of something by a particular amount I’ll knock off £10.knock something off something Travel agents are knocking £50, and sometimes £100, off the price of holidays.3 reduce amount knock something ↔ offCOUNT/CALCULATE to reduce a total by a particular amountknock something off something Moving house will knock an hour off Ray’s journey to work.4 produce knock something ↔ offMAKE to produce something quickly and easily Roland makes a lot of money knocking off copies of famous paintings.5 murder knock somebody ↔ offKILL to murder someone6 steal knock something ↔ off British EnglishSTEAL to steal something → knock→ See Verb table
Examples from the Corpus
knock off• And I know Frank was knocked off.• It took us some time to get to Kitumbeine and the district officer had knocked off.• Is it OK if I knock off a little early tonight?• I usually knock off at about six.• Suppose I tell you the name of the guy who knocked off Mahoney.• By five he had knocked off most of the items on his priority list.• Part of the puzzle had been knocked off onto the floor.• What do you do with an evil one, who is knocking off the neighbors?• Ellie accidentally knocked a cup of milk off the table.• In Newcastle residents would have £32 knocked off their £349 bill if the Government assessment of spending had been more accurate.• Their run through the NCAAs last year, when they knocked off three No. 1 seeds, was no fluke.• Everyone else appeared to have some sort of credit card that knocked off up to 25 percent.knock off early• This could be one night he thinks he might knock off early for dinner at midnight.• I'm going to knock off early today. 