crumble


crumble (http://definr.com/crumble)

     v 1: fall apart; also used metaphorically: "Negociations broke
          down" [syn: crumple, tumble, break down, collapse]
     2: break or fall apart into fragments; "The cookies crumbled";
        "The Sphinx is crumbling" [syn: fall apart]
     3: fall into decay or ruin; "The unoccupied house started to
        decay" [syn: decay, delapidate]