Meaning

• To fall apart; to disintegrate.

  "The empire crumbled when the ruler's indiscretions came to light."

• To break into crumbs.

  "We crumbled some bread into the water."

• To mix (ingredients such as flour and butter) in such a way as to form crumbs.

  "Using your fingers, crumble the ingredients with the fingertips, lifting in an upward motion, until the mixture is sandy and resembles large breadcrumbs."

Meaning

• Material that has crumbled away; crumbs.