wither away
to shrivel up; to shrink up. Soon, the wart withered away. Many of our roses withered away in the hot sun.
wither on the vine
and die on the vine 1. Lit. [for fruit] to shrivel on the vine or stem, unharvested. If we don't get out there into the field, the grapes will wither on the vine. The apples will die on the vine if not picked soon.
2. . Fig. [for someone or something] to be ignored or neglected and thereby be wasted. I hope I get a part in the play. I don't want to just die on the vine. Fred thinks he is withering on the vine because no one has chosen him.
wither up
to shrivel up. It was so hot that the leaves of the trees withered up.