(known as a "crisp" in North America) is a rustic, oven-baked dessert consisting of a stewed fruit base topped with a crumbly mixture of fat, flour, and sugar.

In a broader sense, to describes the process of breaking into small fragments or decaying gradually. The BEST apple crumble recipe .. from Good Food!

: Most crumbles begin with seasonal fruits like apples, rhubarb, or berries. The fruit is often lightly tossed with sugar and spices like cinnamon or nutmeg before being placed in a baking dish.