wilt

1a :  to lose turgor from lack of water the plants wilted in the heatb :  to become limp

2 :  to grow weak or faint :  languish

:  to cause to wilt

1 :  an act or instance of wilting :  the state of being wilted

2a :  a disorder (such as a fungus disease) of plants marked by loss of turgidity in soft tissues with subsequent drooping and often shriveling —called also wilt diseaseb :  polyhedrosis of caterpillars

1 :  to lose freshness and become limp The roses are wilting.

2 :  to lose strength … Mr. Kamata's sturdy … smile was beginning to wilt. — Zilpha Keatley Snyder, The Egypt Game

:  a plant disease (as of tomatoes) in which wilting and browning of leaves leads to death of the plant