Meaning

• A small piece which breaks off from baked food (such as cake, biscuit or bread).

  "The pigeons were happily pecking at crumbs of bread on the ground."

• A small piece of other material, such as rubber.

• A bit, small amount.

  "a crumb of comfort"

• The soft internal portion of bread, surrounded by crust.

• A mixture of sugar, cocoa and milk, used to make industrial chocolate.

• A nobody; a worthless person.

• A body louse (Pediculus humanus).

Meaning

• To cover with crumbs.

• To break into crumbs or small pieces with the fingers; to crumble.

  "to crumb bread"