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. To make smart or spruce; -- usually with up.[Colloq.] “She had to go and smarten herself up somewhat.” — W. Black.