A cheap imitation of something popular, produced illegally without a license from the trademark owner, and of inferior materials.
Expression used within the furniture industry to refer to an obvious copy of a popular design that has been reproduced for sale at a lower price than the quality original.
is a copy of the original. Xerox was the first company to come out with a copier. Other companies made knockoffs. Tempurpedic was the first company to come out with memory foam. Other companies have knockoffs, some good, some not so good.