Meaning of “pass sth/sb off as sth/sb” - Learner’s Dictionary

pass sth/sb off as sth/sb

phrasal verb with pass us uk /pɑːs/ verb

to pretend that something or someone is different from what they really are:

He tried to pass himself off as some sort of expert.

(Definition of “pass sth/sb off as sth/sb” from the Cambridge Learner’s Dictionary © Cambridge University Press)