To make neat and trim:
dress and groom with particular care, as for a special occasion
To make decorative additions to; spruce up.
Find another word for smarten-up. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for smarten-up, like: spruce-up, spruce, slick up, titivate, tittivate and spiff-up.