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}]