too big for (one's) own britches

Overconfident in one's importance, skill, or authority; behaving as if one is more important or influential than one actually is. She's gotten too big for her own britches ever since she got that promotion. John's been acting too big for his own britches now that he's been scouted by pro teams.

See also: big, britches, for, own

See also:

britches
get too big for (one's) britches
drive (one) out of office
force (one) out of office
force out of office
give (one) (one's) head
give somebody their head
give someone his or her head
give someone his/her head, to

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