the adjective 'spruced-up' derives from the phrasal verb 'to spruce up,' which emerged in the late 16th century. its core component, 'spruce,' originally referred to prussia (via 'pruce') and its prized imports, including fine leather and the neat, symmetrical spruce fir tree. this association with neat, smart appearance transformed 'spruce' into an adjective and later a verb meaning 'to make neat.' the addition of the completive particle 'up,' common in english phrasal verbs, intensifies the action, giving a sense of thoroughness in grooming or improving appearance. thus, 'spruced-up' logically combines the concept of achieving a smart, tidy state with the notion of completing that process.

Structure: spruce (neat) + up (completive particle) spruce (origin: middle english, from anglo-french pruce, short for pruce fir, i.e., prussian fir; functional role: provides the core meaning of neatness or smartness, influenced by the tree's association with neatness and the verb 'to spruce') + up (origin: old english up, upp; functional role: an adverbial particle indicating completion or intensification of the action/state)