v. 1 tr. & intr. (often foll. by up) make or become dry and shrivelled (withered flowers). 2 tr. & intr. (often foll. by away) deprive of or lose vigour, vitality, freshness, or importance. 3 intr. decay, decline. 4 tr. a blight with scorn etc. b (as withering adj.) scornful (a withering look). witheringly adv.
[ ME, app. var. of WEATHER differentiated for certain senses ]