too big for (one's) breeches(redirected from too big for one's breeches)
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too big for (one's) breeches
Overconfident in one's importance, skill, or authority; behaving as if one is more important or influential than one actually is. He's gotten too big for his breeches ever since he got that promotion. John's been too big for his breeches now that he's been scouted by pro teams.