D defs.my
Entry 1 sense Webster, 1913

Smarten

/smär'-tən/ · Smart·en · IPA /ˈsmɑːt(ə)n/
01 v. t. To make smart or spruce; -- usually with up.
  1. 1.
    To make smart or spruce; -- usually with up.[Colloq.]
    “She had to go and smarten herself up somewhat.” — W. Black.