knock off

from the GNU version of the Collaborative International Dictionary of English.

• verb to quit (working).
• verb to accomplish; -- frequently used when the task is accomplished rapidly.
• verb colloq. to kill; to defeat (opponents).
• verb to discount, to deduct (a sum from a price).
• verb to rob.
• verb to make a knockoff of; to copy or imitate, usually without permission or admission of copying.
• noun a device in a knitting machine to remove loops from the needles.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative form of knockoff.
• verb Used other than as an idiom: see knock,‎ off.
• verb transitive To bump or hit so that something falls off
• verb idiomatic, intransitive To quit; stop doing work or other activity. The term originated from the practice aboard slave galleys to have a man beat time for the rowers by knocking on a block or drum; when he stopped, the rowers could rest.
• verb idiomatic To kill someone
• verb idiomatic To reduce or remove
• verb idiomatic To steal.
• verb transitive To make a copy of, as of a design.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb cut the price of
• verb write quickly
• verb take by theft
• verb get rid of (someone who may be a threat) by killing
• verb stop pursuing or acting