from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Informal An unauthorized copy or imitation, as of designer clothing: "the place to go for quality knockoffs” ( Women's Wear Daily).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An imitation of something, particularly a well-known product, usually lower in quality and price than the original.
from the GNU version of the Collaborative International Dictionary of English
- n. A cheap imitation of something popular, produced illegally without a license from the trademark owner, and of inferior materials.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an unauthorized copy or imitation
knock + off (Wiktionary)