no obj.
1- (of a plant, leaf, or flower) become limp through heat, loss of water, or disease; droop（植物, 叶, 花）枯萎, 凋谢。
1.1
- (of a person) lose one's energy or vigour（人）变得萎靡不振, 变得无精打采。
1.2
- with obj. leave (mown grass or a forage crop) in the open to dry partially before being collected for silage（青贮前）将（割的草、饲料作物）晒成半干。
mass noun［usu. with modifier］
- any of a number of fungal or bacterial diseases of plants characterized by wilting of the foliage萎蔫病。
词源
late 17th cent. (originally dialect)： perhaps an alteration of dialect welk 'lose freshness'， of Low German origin.