Words at Play : Words We Don't Hear Anymore
Definition:
: breeches, trousers
About the Word:
A variation on breeches, an old word for trousers or pants, britches isn't a word you're likely to see on clothes racks these days. But the word persists in the idiom too big for one's britches still as applicable today as ever.
That phrase refers to someone who has an exaggerated sense of their own importance, position, or abilities; and with bosses today complaining about millennials who think they can be CEO after a month on the job, we just might see this term come back into vogue.