a big head

a big head

1. An exaggerated sense of one's importance or status. Often used with the verbs "get" or "have." Jeff has such a big head now that he's captain and thinks he's in charge of everything. Susan got a big head for a while after her promotion, but she's been more modest recently.
2. A conceited person who exaggerates their own importance or skillfulness. Bill is such a big-head and thinks he's smarter than everyone else just because he has his PhD.
See also: big, head
Farlex Dictionary of Idioms.
See also:
  • be along
  • will be along
  • under the carpet
  • under the rug
  • upper hand
  • the upper hand
  • a brick in (one's) hat
  • the shock of (one's) life
  • the shock of life
  • (one's) lord and master