grub
     n 1: informal terms for a meal [syn: {chow}, {chuck}, {eats}]
     2: a soft thick wormlike larva of certain beetles and other
        insects
     v 1: ask for and get free; be a parasite [syn: {mooch}, {bum}, {cadge},
           {sponge}]
     2: search about busily
     [also: {grubbing}, {grubbed}]
Source: WordNet® 2.0

GRUB
     GRand Unified Bootloader (GNU)
     
     
Source: Virtual Entity of Relevant Acronyms