1
general::
Phrase(s): pawn someone or something off (on someone) (as someone or something)
Go to palm someone or something off (on someone) (as someone or something).
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Dispose of by deception, as in They tried to pawn off a rebuilt computer as new. This expression may have originated as a corruption of PALM OFF, although it was Also put as pawn upon in the 1700s, when it originated.
American Heritage Idioms