The bread roll crumbled when I tried to slice it; it was too stale.
verb To break into crumbs.
We crumbled some bread into the water.
verb 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.
noun A dessert of British origin containing stewed fruit topped with a crumbly mixture of fat, flour, and sugar.