too big for one's britches
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US origin, 19th c.
- (idiomatic) Disturbingly confident, unacceptably cocky.
- Synonym: too big for one's boots
- 1989, Edwin M. Reingold, "Hard Times for Teflon Tom," Time, 22 May:
- A diffident, dedicated man, Bradley seemed the personification of rectitude. He never got too big for his britches.
- Used other than with a figurative or idiomatic meaning: Too large to fit into one's pants.