[crum.ble] vb crum.bled ; crum.bling [alter. of ME kremelen, freq. of OE gecrymian to crumble, fr. cruma] vt (1570): to break into small pieces ~ vi 1: to fall into small pieces: disintegrate
2: to break down completely: collapse "marriages ~"
[2]crumble n (1820) 1: something crumbled: fine debris
2: crisp
2.