'too big for one's breeches' definitions:

(used colloquially) overly conceited or arrogant; "a snotty little scion of a degenerate family"-Laurent Le Sage; "they're snobs--stuck-up and uppity and persnickety" [syn: bigheaded, persnickety, snooty, snot-nosed, snotty, stuck-up, too big for one's breeches, uppish]