[no obj.]break or fall apart into small fragments, especially over a period of time as part of a process of deterioration 崩溃;瓦解 the plaster started to crumble. 石灰墙开始崩裂了。 [as adj. crumbling]their crumbling ancestral home. 他们将要倒塌的祖屋。 ■[with obj.]cause (something) to break apart into small fragments 使…破碎;使…碎裂 the easiest way to crumble blue cheese. 碾碎蓝奶酪最简单的方法。 ■(of an organization, relationship, or structure) disintegrate gradually over a period of time (组织,关系,结构)瓦解;分裂 the party's fragile unity began to crumble. 该党脆弱的联合开始瓦解了。
noun
(Brit.)a mixture of flour and fat that is rubbed to the texture of breadcrumbs and cooked as a topping for fruit (英)(由面粉和脂肪混合制成,烹调时作为水果浇头的)酥皮 ■[mass noun]a pudding made with such a topping and a particular fruit (特定水果加酥皮制成的)布丁 apple crumble. 苹果布丁。
语源
late Middle English: probably from an Old English word related to crumb