too big for (one's) own britches

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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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