Source : Webster's Revised Unabridged Dictionary (1913)

Crump \Crump\ (kr?mp), a. [AS. crumb stooping, bent down; akin
   to OHG. chrumb, G. krumm, Dan. krum, D. krom, and E. cramp.]
   1. Crooked; bent. [Obs.]

            Crooked backs and crump shoulders.    --Jer. Taylor.

   2. Hard or crusty; dry baked; as, a crump loaf. [Prov. Eng. &
      Scot.] --Hallivell.

Source : WordNet®

crump
     v 1: make a noise typical of an engine lacking lubricants [syn: {thud},
           {scrunch}]
     2: bombard with heavy shells
     3: explode heavily or with a loud dull noise