Quick definitions from WordNet (crumb)

▸ noun:  small piece of e.g. bread or cake
▸ noun:  a very small quantity of something ("He gave only a crumb of information about his plans")
▸ noun:  a person who is deemed to be despicable or contemptible
▸ verb:  break into crumbs
▸ verb:  coat with bread crumbs ("Crumb a cutlet")
▸ verb:  remove crumbs from ("Crumb the table")
▸ name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8147)

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▸ Also see crumb