give yourself airs

give (oneself) airs

To think or behave as though one is superior to others or better than one really is; to have or assume a pretentious or self-aggrandizing attitude. I think John is really a decent fellow at heart, but I really wish he wouldn't give himself such airs about his writing abilities. Stop giving yourself airs, Mary, you're not some world-class actor—you're just an amateur like the rest of us!
See also: air, give
Farlex Dictionary of Idioms.

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
Farlex Partner Idioms Dictionary

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
Farlex Partner Idioms Dictionary
See also:
  • assume
  • assume airs
  • assumed
  • give (oneself) airs
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give someone their head
References in classic literature
`I have answered three questions, and that is enough,' Said his father; `don't give yourself airs! Do you think I can listen all day to such stuff?
"You, forsooth, must give yourself airs of virtue, while my wife, who is an immaculate saint, as everybody knows, and never did wrong in her life, has no objection to meet my young friend Mrs.
How dare you give yourself airs. Don't tell anyone about this.
"Don't give yourself airs," was Chester's reply, "at least I'm pure." Wystan had indeed slept with women, besides Rhoda Jaffe with whom he had a serious affair in 1946.