1. [n]  small piece of e.g. bread or cake
2. [n]  a person who is deemed to be despicable or contemptible; "only a rotter would do that"; "kill the rat"; "throw the bum out"; "you cowardly little pukes!"
3. [v]  remove crumbs from; "crumb the table"
4. [v]  break into crumbs
5. [v]  coat with bread crumbs; "crumb a cutlet"

1. \Crumb\ (kr[u^]m), 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.
   

2. \Crumb\, v. t. [imp. & p. p. {Crumbed} (kr?md); p. pr. &
   vb. n. {Crumbing} (kr?m"?ng).]
   To break into crumbs or small pieces with the fingers; as, to
   crumb bread. [Written also {crum}.]
   

Two binary digits; a quad. Larger than a bit, smaller than a nibble. Considered silly. Synonym tayste.