v.1. To offer, sell, or circulate something that is an imitation as though it were genuine: Some dishonest merchants are able to pass off glass as a gemstone.
2. To present someone as something else. Often used reflexively: He tried to pass himself off as a banker, even though he has no experience in finance. The clever spy passed herself off as a store clerk. My friend passed the refugee off as a visiting cousin when the landlord asked who he was.
3. To disregard or ignore something by considering it to have some negative quality: I passed his snide comment off as a joke. They pass off everything I say as ignorant.