pass sb off as使假扮成
pass sth off as以某物冒充
pass off as officials冒充官员
pass off as genuine以假乱真
pass off as fake以假乱真
PHRASAL VERB（动词词组） If you pass something off as another thing, you convince people that it is that other thing. 把…冒充为
He passed himself off as a senior psychologist.
他自己冒充是一名资深心理学家。