岩块剥落
Crumble \Crum"ble\ (kr?m"b'l), v. t. [imp. & p. p. {Crumbled} (-b'ld); p. pr. & vb. n. {Crumbling} (-bl?ng).] [Dim. of crumb, v. t., akin to D. krimelen G. kr?meln.] To break into small pieces; to cause to fall in pieces. He with his bare wand can unthread thy joints, And crumble all thy sinews. --Milton.