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From The Collaborative International Dictionary of English v.0.48:
Wilt \Wilt\, v. i. [imp. & p. p. Wilting.] [Written also welt, a modification of welk.] To begin to wither; to lose freshness and become flaccid, as a plant when exposed when exposed to drought, or to great heat in a dry day, or when separated from its root; to droop;. to wither. [Prov. Eng. & U. S.] [1913 Webster]