'knockoff' definitions:

Definition of 'knockoff'

From: WordNet
noun
An unauthorized copy or imitation [syn: knockoff, clone]

Definition of 'knockoff'

From: GCIDE
  • knockoff \knock"off\, n. A cheap imitation of something popular, produced illegally without a license from the trademark owner, and of inferior materials. [Also spelled knock-off.] [PJC]