smart·en 
/ˈsmɑɚtn̩/ verb
smart·ens; smart·ened; smart·en·ing /ˈsmɑɚtn̩/ verb Meaning:
smarten up [phrasal verb] 1 US a : to become more intelligent or aware : to become smarter
▪ He told me to smarten up and pay attention to the teacher. ▪ He'd better smarten up [=wise up] or he'll get fired.
b smarten (someone or something) up or smarten up (someone or something) : to make (someone or something) smarter or more aware
▪ Someone needs to smarten him up before he gets in trouble. 2 smarten (someone or something) up or smarten up (someone or something) : to make (someone or something) neat and attractive
▪ They smartened [=spruced] themselves up for the party. ▪ They smartened up the room for the party.
▪ He told me to smarten up and pay attention to the teacher. ▪ He'd better smarten up [=wise up] or he'll get fired.
b smarten (someone or something) up or smarten up (someone or something) : to make (someone or something) smarter or more aware
▪ Someone needs to smarten him up before he gets in trouble.
▪ They smartened [=spruced] themselves up for the party. ▪ They smartened up the room for the party.
