to crumble down;  to tumble down;  to fall in
 collapsing load (as on lorries, trucks)
 to begin to crumble;  to crumble and fall (or collapse) onto another object
 falling apart while cooking
 to crumble away;  to collapse
 losing shape (of clothing, etc.);  losing form
 losing shape (of clothing, etc.);  losing form
 losing shape (of clothing, etc.);  losing form
 falling apart while cooking
 break (change for the worse) in the weather