The word 'upholster' has a surprisingly literal origin in the furniture trade. It derives from the Middle English term 'upholder', which referred to a tradesman who held up or maintained goods, specifically a dealer in small furnishings. The verb form 'upholster' emerged by the 17th century, back-formed from 'upholsterer'. Its components, 'up-' (intensive) and the obsolete 'holster' (from Middle English, meaning "to hold or keep"), combine to create the sense of "one who holds up or provides (furnishings)". Over time, the meaning narrowed from the general dealer to the specific craft of fitting furniture with padding, springs, and fabric coverings, which "holds up" the soft materials and the user.

Structure: up + holster - up: Old English origin, meaning "up, upward". In this word, it functions as an intensifying prefix. - holster: Middle English origin, from 'holster' meaning "to hold, to keep". In this word, it functions as the core root meaning "to hold, to keep".