crumb

noun

• 1a small fragment of bread, cake, or biscuit: she brushed some cake crumbs off her dress [as modifier]:a crispy crumb topping
• [mass noun] the soft inner part of a loaf of bread: a morsel of crumb will often tempt a chub

• 2a very small amount of something:the Budget provided few crumbs of comfort

• 3 informal, chiefly North American an objectionable or contemptible person:he’s an absolute crumb

• 4 (also crumb rubber) [mass noun] granulated rubber, usually made from recycled car tyres.

verb

• cover (food) with breadcrumbs: (as adjective crumbed)crispy crumbed mushrooms with garlic dip