Britches meaning
Breeches.
pluralNoun
too big for (one's) britches
- Overconfident; cocky.
idiom
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Idioms and Phrasal Verbs
Origin of britches
- Alteration of breeches pl. of breech
From American Heritage Dictionary of the English Language, 5th Edition
- Alteration of breeches (“trousers, pantaloons”) in use since at least the 18th century in Britain and British colonies.
From Wiktionary