Question

can wither be a verb

Answer 1

Indeed, wither can be a verb,it could utilized with object or not.
The significance of wither: wilt; blur; rot.
We use wither without object.For instance (The plants had withered from neglect)

At the point when we use wither with object,it means: flabby, contracted, or dry, as from loss of dampness.  
to abash, as by a scorching glance.
to influence hurtfully.For example,Notorieties were withered by the embarrassment.

Answer 2

Undoubtedly, WITHER can be a (verb), the importance of wither: become more fragile or more modest and afterward disappear.For example,They stress that regarded customs will wither.