WordWeb Online

1. Make neat, smart, or trim
   "smarten up your house for Spring";
   - spruce up, spruce, titivate, tittivate [rare], slick up [N. Amer], spiff up [N. Amer, informal], smarten
    
2. Dress and groom with particular care, as for a special occasion
   "He smartened up for the party";
   - spruce up, spruce, slick up [N. Amer], smarten

Derived forms: smartening up, smartened up, smartens up

Type of: beautify, embellish, fancify, groom, neaten, prettify