to age
grow up
καλιεργώ / kaliergo μεγαλώνω / megalono means "grow up"
Tire
fledge
Adult comes from the Latin word adultus, which means "grown up." Adultus is a derivative of the Latin word adolescere which means "to grow up" which is also the root for our word "adolescent." (And don't we all know adults who act like adolescents.)
Expand Grow
igu means I give up.
Better; expand; grow.
Dawn.
A one-syllable word meaning to get bigger is "grow".
"Heliotropic" means to move or grow in the direction of the sun (such as the plant called Heliotrope), which may or may not be what you were looking for.
Dawn