buttoned-up

The term 'buttoned-up' is a phrasal adjective originating in the early 20th century, directly derived from the literal action of fastening one's garments securely with buttons. The core component, 'button', traces back to the Old French 'boton' (a bud, knob), which metaphorically evolved to denote a clothing fastener. The addition of the adjectival suffix '-ed' and the particle 'up' creates a sense of completeness and thoroughness in the fastening. This literal image of being fully and formally fastened was then figuratively extended to describe a person's reserved, formal, and emotionally restrained character, mirroring the contained and proper appearance of tightly buttoned clothing.

Structure: button + ed + up - button: From Old French 'boton', meaning a bud or a knob, used as a fastener. In this compound, it represents the fastening element. - ed: A suffix of Germanic origin (Old English '-ed', '-od', '-ad') used to form adjectives from nouns, indicating 'having' or 'provided with'. - up: From Old English 'up', 'upp', meaning upward, to a higher position or state. Here, it functions as an adverbial particle completing the phrasal concept.