To break into small pieces with the fingers: as, to crumb bread into milk.
. To crumble bread into; prepare or thicken with crumbs of bread.
In cookery, to cover or dress with breadcrumbs, as meat, etc.; bread.
noun.
A morsel: specifically, a minute piece of bread or other friable food broken off, as in crumbling it; hence, a very small fragment or portion of anything.
noun.
The soft inner part of a loaf of bread or cake, as distinguished from the crust.
Same as crump.