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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 the NBA.
See also: big, breech

kick in the pants, a

1. Also, a kick in the teeth. A humiliating setback or rebuff. For example, That rejection was a real kick in the pants, or That review was a kick in the teeth. A third, vulgar variant of these colloquial terms is a kick in the ass. Versions of this last expression- kick in the breech, kick in the behind-have been used since the early 1800s.
2. A cause of enjoyment, as in That show was a real kick in the pants. This meaning is virtually the opposite of def. 1 and can be differentiated from it only by the context. [1960s]
See also: kick