crumb: [OE] Relatives of crumb are fairly widespread in the Germanic languages – German has krume, for example, and Dutch kruim – and it is represented in some non- Germanic Indo-European languages, such as Greek grūméā and even Albanian grime. As these forms indicate, the b is not original (the Old English word was cruma); it first appeared in the 16th century, but crum remained an accepted spelling well into the 19th century. The derivative crumble appeared in the 16th century. => crumble[crumb etymology, crumb origin, 英语词源]