Definitions of crumb:

• noun:   small piece of e.g. bread or cake
• noun:   a very small quantity of something

  Example: "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

  Example: "Crumb a cutlet"

• verb:   remove crumbs from

  Example: "Crumb the table"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8147)