Etymology
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wilt (v.)

1690s, "to fade, droop, wither," probably an alteration of welk "to wilt," probably from Middle Dutch or Middle Low German welken "to wither," cognate with Old High German irwelhen "become soft," from Proto-Germanic *welk-, from PIE root *welg- "wet" (see welkin). Transitive sense of "cause to fade or droop" is from 1809. Related: Wilted; wilting.

updated on April 06, 2014

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Definitions of wilt from WordNet
1
wilt (v.)
lose strength;
My opponent was wilting
wilt (v.)
become limp;
The flowers wilted
Synonyms: droop
2
wilt (n.)
any plant disease characterized by drooping and shriveling; usually caused by parasites attacking the roots;
Synonyms: wilt disease
wilt (n.)
causing to become limp or drooping;
Synonyms: wilting
From wordnet.princeton.edu, not affiliated with etymonline.