What is the meaning of Crumb?

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

A small piece of any other solid substance.

A bit, small amount.

Short for crumb rubber.

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).

To cover with crumbs.

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

Alternative form of crump

Source: wiktionary.org