noun

1. 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.”

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

3. A bit, small amount.

   “a crumb of comfort”

Synonyms: crumbling

verb

1. To cover with crumbs.

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

   “to crumb bread”