Crumb (krŭm), n. [AS. cruma, akin to D. kruim, G. krume; cf. G. krauen to scratch, claw.] [Written also crum.] 1. A small fragment or piece; especially, a small piece of bread or other food, broken or cut off.
Desiring to be fed with the crumbs which fell from the rich man's table.
Luke xvi. 21.
2. Fig.: A little; a bit; as, a crumb of comfort.
3. The soft part of bread.
Dust unto dust, what must be, must;
If you can't get crumb, you'd best eat crust.
Old Song.
Crumb brush, a brush for sweeping crumbs from a table. — To a crum, with great exactness; completely.