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Take a break or rest from, stop, especially quit working. For example, He knocked off work at noon , or Let's knock off at five o'clock . [ Colloquial ; mid-1600s] Also see knock it off .

Also, knock out . Dispose of or produce easily or hastily, finish, as in A writer of detective novels, he knocks off a book a year , or We can knock out a rough drawing in a few minutes . The first colloquial usage dates from the early 1800s, the variant from the mid-1800s.

Get rid of, reduce, as in She knocked off twelve pounds in a month , or They knocked off one-third of the original price . [ Colloquial ; early 1800s]

Kill, murder, as in They decided to knock off the old lady . [ Slang ; early 1900s] Also see knock someone's block off .

Copy or imitate, especially without permission, as in They are knocking off designer Swiss watches and selling them for a few dollars . [ Colloquial ; late 1800s]

Hold up, rob, as in The gang knocked off two liquor stores in half an hour . [ Slang ; early 1900s] Also see knock the socks off .