The Collaborative International Dictionary of English v.0.48:

Gob \Gob\ (g[o^]b), n. [Cf. Goaf.] (Mining)
   Same as Goaf.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gob \Gob\, n. [OF. gob morsel; cf. F. gobe, gobbe, a poisoned
   morsel, poison ball, gobet a piece swallowed, gober to
   swallow greedily and without tasting; cf. Gael. & Ir. gob
   mouth, snout, W. gwp a bird's head and neck. Cf. Gobble,
   Job, n.]
   1. A little mass or collection; a small quantity; a mouthful.
      [Low] --L'Estrange.
      [1913 Webster]

   2. The mouth. [Prov. Eng.or Low] --Wright.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gob \Gob\ (g[o^]b), n.
   Same as sailor. [Colloq.]
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Goaf \Goaf\; n.; pl. Goafsor Goaves. [Cf. 1st Gob.]
   (Mining)
   That part of a mine from which the mineral has been partially
   or wholly removed; the waste left in old workings; -- called
   also gob .
   [1913 Webster]

   To work the goaf or To work the gob, to remove the
      pillars of mineral matter previously left to support the
      roof, and replace them with props. --Ure.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gob
    n 1: a man who serves as a sailor [syn: mariner, seaman,
         tar, Jack-tar, Jack, old salt, seafarer, gob,
         sea dog]
    2: a lump of slimy stuff; "a gob of phlegm"
    3: informal terms for the mouth [syn: trap, cakehole,
       hole, maw, yap, gob]

Moby Thesaurus II by Grady Ward, 1.0:

174 Moby Thesaurus words for "gob":
   Naval Reservist, Royal Marine, Seabee, accumulation, acervation,
   agglomerate, agglomeration, aggregate, aggregation, amassment,
   amount, ball, balloon, batch, bazoo, bit, bite, bladder, blob,
   block, bluejacket, boll, bolus, boot, bubble, budget, bulb, bulbil,
   bulblet, bulk, bunch, butt, cadet, champ, chaps, chaw, chew, chip,
   chomp, chops, chunk, clip, clipping, clod, clump, clutch, collop,
   congeries, conglobation, conglomerate, conglomeration, count,
   crumb, cud, cumulation, cut, cutting, deal, dollop, dose,
   ellipsoid, embouchure, end, fragment, frogman, gab, gathering,
   geoid, globe, globelet, globoid, globule, glomeration, glomerulus,
   gnash, gobbet, group, heap, horse marine, hunch, hunk, jaw, jaws,
   jolly, jowls, kisser, knob, knot, large amount, lips, loads, loaf,
   lot, lump, mandibles, marine, mass, maw, maxilla, measure, mess,
   midshipman, midshipmite, million, modicum, moiety, morsel, mouth,
   mouthful, mug, munch, mush, muzzle, naval cadet, navy man, nibble,
   nip, nugget, number, oblate spheroid, oodles, oral cavity, orb,
   orbit, orblet, pack, parcel, paring, part, particle, pat, pellet,
   piece, portion, premaxilla, prolate spheroid, quantities, quantity,
   quid, rasher, ration, rondure, row, scoop, scrap, shard, shaving,
   shiver, shred, slice, sliver, small amount, smithereen, snack,
   snap, snatch, snip, snippet, snowball, sphere, spheroid, spherule,
   splinter, stitch, stockpile, stump, sum, swabbie, swallow, tatter,
   trap, wad, wads, yap



Easton's 1897 Bible Dictionary:

Gob
   a pit, a place mentioned in 2 Sam. 21:18, 19; called also Gezer,
   in 1 Chr. 20:4.


Hitchcock's Bible Names Dictionary (late 1800's):

Gob, cistern; grasshopper