button-up

The term 'button-up' is a modern English compound adjective formed from the phrasal verb 'to button up'. The literal sense derives from the action of fastening all the buttons on a garment, particularly a shirt, from the bottom to the top. This concrete action evolved into an adjective describing garments featuring a full vertical row of buttons. By metaphorical extension in mid-20th century American English, this sartorial characteristic became associated with the neat, orderly, and formal appearance it creates, leading to its secondary meaning describing a conventionally conservative demeanor or style. The logic traces a clear path from a physical action to a descriptor of clothing, and finally to an associated personality trait.

Structure: button (fastening device) + up (completely, fastened) - button: From Old French 'boton', meaning 'a bud, knob, or button', itself likely from a Germanic root related to pushing. In this compound, it functions as the nominal element denoting the fastening device. - up: From Old English 'up', 'upp', of Germanic origin. In this phrasal compound, it functions as an adverbial particle indicating the action of fastening something completely or securely.