no obj.
1- break or fall apart into small fragments, especially over a period of time as part of a process of deterioration破碎, 碎裂：
the plaster started to crumble
灰泥开始碎裂了
as adj. crumbling their crumbling ancestral home他们家摇摇欲坠的祖屋。
1.1
- with obj. cause (something) to break apart into small fragments使破碎, 使碎裂：
the easiest way to crumble blue cheese
把蓝奶酪弄碎的最简单的方法。
1.2
- (of an organization, relationship, or structure) disintegrate gradually over a period of time（组织, 关系, 结构）瓦解, 崩溃：
the party's fragile unity began to crumble.
该党脆弱的统一开始瓦解了。
1
- Brit. a mixture of flour and fat that is rubbed to the texture of breadcrumbs and cooked as a topping for fruit〈英〉（经烹调用作水果浇头的）脂质面包屑。
1.1
- mass noun a pudding made with such a topping and a particular fruit面包屑水果布丁：
apple crumble
面包屑苹果布丁。
词源
late Middle English: probably from an Old English word related to CRUMB.