v. & n.
—v.
1 intr. (of a plant, leaf, or flower) wither, droop.
2 intr. (of a person) lose one's energy, flag, tire, droop.
3 tr. cause to wilt.
—n. a plant-disease causing wilting.
Etymology: orig. dial.: perh. alt. f. wilk, welk, of LG or Du. orig.
2.
archaic 2nd person sing. of WILL(1).
Useful english dictionary. 2012.