swelled head, have a

have a swelled head

To be conceited, arrogant, or self-aggrandizing. Cheryl has such a big head on her, all she ever talks about is herself. Janice has had a bit of a big head ever since she got that promotion.
See also: have, head, swell
Farlex Dictionary of Idioms.

swelled head, have a

Be conceited, as in Winning all those prizes has not given her a swelled head, at least not yet. This idiom began as be swellheaded, first recorded in 1817. The present form dates from about 1860. For a synonym see big head.
See also: have, swell
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • have a big head
  • have a fat head
  • have a swelled head
  • swell
  • swelled head
  • swelled head, to have a
  • big head, have a
  • big-C
  • big C
  • the big C