to become limp and drooping, as a fading flower; wither.
to lose strength, vigor, assurance, etc.: to wilt after a day's hard work.
to cause to wilt.
the act of wilting, or the state of being wilted: a sudden wilt of interest in the discussion.
Plant Pathology. the drying out, drooping, and withering of the leaves of a plant due to inadequate water supply, excessive transpiration, or vascular disease. a disease so characterized, as fusarium wilt.