The Collaborative International Dictionary of English v.0.48:

Grub \Grub\ (gr[u^]b), v. i. [imp. & p. p. Grubbed (gr[u^]bd),
   p. pr. & vb. n. Grubbing.] [OE. grubbin., cf. E. grab,
   grope.]
   1. To dig in or under the ground, generally for an object
      that is difficult to reach or extricate; to be occupied in
      digging.
      [1913 Webster]

   2. To drudge; to do menial work. --Richardson.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grub \Grub\, v. t.
   1. To dig; to dig up by the roots; to root out by digging; --
      followed by up; as, to grub up trees, rushes, or sedge.
      [1913 Webster]

            They do not attempt to grub up the root of sin.
                                                  --Hare.
      [1913 Webster]

   2. To supply with food. [Slang] --Dickens.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grub \Grub\, n.
   1. (Zool.) The larva of an insect, especially of a beetle; --
      called also grubworm. See Illust. of Goldsmith beetle,
      under Goldsmith.
      [1913 Webster]

            Yet your butterfly was a grub.        --Shak.
      [1913 Webster]

   2. A short, thick man; a dwarf. [Obs.] --Carew.
      [1913 Webster]

   3. Victuals; food. [Slang] --Halliwell.
      [1913 Webster]

   Grub ax or Grub axe, a kind of mattock used in grubbing
      up roots, etc.

   Grub breaker. Same as Grub hook (below).

   Grub hoe, a heavy hoe for grubbing.

   Grub hook, a plowlike implement for uprooting stumps,
      breaking roots, etc.

   Grub saw, a handsaw used for sawing marble.

   Grub Street, a street in London (now called Milton
      Street), described by Dr. Johnson as "much inhabited by
      writers of small histories, dictionaries, and temporary
      poems, whence any mean production is called grubstreet."
      As an adjective, suitable to, or resembling the production
      of, Grub Street.
      [1913 Webster]

            I 'd sooner ballads write, and grubstreet lays.
                                                  --Gap.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sneak \Sneak\, n.
   1. A mean, sneaking fellow.
      [1913 Webster]

            A set of simpletons and superstitious sneaks.
                                                  --Glanvill.
      [1913 Webster]

   2. (Cricket) A ball bowled so as to roll along the ground; --
      called also grub. [Cant] --R. A. Proctor.
      [1913 Webster]

WordNet (r) 3.0 (2006):

grub
    n 1: informal terms for a meal [syn: chow, chuck, eats,
         grub]
    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, grub, sponge]
    2: search about busily

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "grub":
   accumulate, amass, assemble, aurelia, beast of burden, beat, bore,
   bring together, burrow, caterpillar, chow, chrysalis, chuck,
   cocoon, collect, comb, cull, delve, dig, dig out, dig up, dike,
   dredge, drill, drive, drudge, eats, edibles, excavate, fag, feed,
   forage, furrow, galley slave, gather, gather in, get in,
   get together, glean, gouge, gouge out, greasy grind, grind, groove,
   grub up, grubber, grubbery, hack, hammer, hammer away, hireling,
   larva, lower, maggot, mercenary, mine, moil, muck, nurture, nymph,
   nympha, peg, peg away, pick, pick up, plod, plodder, pluck, plug,
   plug along, plug away, poke, pound away, provender, provisions,
   pupa, quarry, rake, rake up, ransack, root, round up, rummage, sap,
   scare up, scoop, scoop out, scrabble, scrape, scrape together,
   scrape up, scratch, search, shovel, sink, slave, slavey, slog,
   slogger, spade, swot, take up, toil, travail, trench, trough,
   tunnel, viands, victuals, wade through, wiggler, work away,
   workhorse, wriggler



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GRUB
       GRand Unified Bootloader (GNU)