give yourself/put on airs

put on airs

 and give oneself airs
Fig. to act better than one really is; to pretend to be good or to be superior. Pay no attention to her. She is just putting on airs. Stop giving yourself airs and act like the rest of us.
See also: air, on, put

put on airs

Assume a haughty manner, pretend to be better than one is, as in I'm sick of Claire and the way she puts on airs. Airs here means "a manner of superiority." [c. 1700]
See also: air, on, put

put on airs

If someone puts on airs, they behave in a way which shows that they think they are better or more important than other people. She thought the coat was far too grand. "People will think I'm putting on airs." He put on no airs, but his charisma was enormous.
See also: air, on, put

give yourself airs

act pretentiously or snobbishly.
1948 Christopher Bush The Case of the Second Chance It was said she gave herself airs, and it was also hinted that she was no better—as they say—than she might be.
Air in the sense of ‘an affected manner’ has been current since the mid 17th century; from the early 18th century the plural form has been more usual in this derogatory sense.
See also: air, give

ˌgive yourself/ˌput on ˈairs

behave in a way which shows that you feel you are important: The nice thing about her is that, in spite of being so rich, she doesn’t put on any airs.
See also: air, give, on, put