grub 
(grŭb)
(grŭb)v. grubbed, grub·bing, grubs
v.tr.
1. To dig up by or as if by the roots: grubbed carrots with a stick.
2. To clear of roots and stumps by digging: grubbed a small plot.
3. Slang To obtain by importunity: grub a cigarette.
v.intr.
1. To dig in the earth: grub for potatoes.
2.
a. To search laboriously by or as if by digging; rummage.
b. To toil arduously; drudge: grub for a living.
n.
1. The thick wormlike larva of certain beetles and other insects.
2. A drudge.
3. Slang Food.
[Middle English grubben, from Old English *grybban; see ghrebh-2 in the Appendix of Indo-European roots.]
grubber n.