smartens;
smartened;
smartening
smartens;
smartened;
smartening
Britannica Dictionary definition of SMARTEN
smarten up
[phrasal verb]
1
US
a
:
to become more intelligent or aware
:
to become smarter
b
smarten (someone or something) up
or
smarten up (someone or something)
:
to make (someone or something) smarter or more aware
2
smarten (someone or something) up
or
smarten up (someone or something)
:
to make (someone or something) neat and attractive