Will't means to wither to fade,dry up,damp,moist. To become limp,as from heat or from lack of water,droop,to become weak lose strength,lose courage. a wilting is a highly infectious disease among caterpillars in which the carcasses liquify,any of infectious plant diseases by bacteria or fungi characterised by wilting of the leaves also from a wilt disease.Hope this helps you understand the meaning enjoy the rest of your day :)