Yes, a noun. A haughty sort of person who swings their breeches side to side as they walk, full of pomp and circumstance. An obsolete slang term I've come across in my cutthroats research. A person who swings their breeches. A quakebreech is a coward, a shuffle-breeches moves slowly, and the cowardly shit-breech adds nothing to society but the load in their pants.