The Collaborative International Dictionary of English v.0.48:

Bog \Bog\, v. t. [imp. & p. p. Bogged; p. pr. & vb. n.
   Bogging.]
   To sink, as into a bog; to submerge in a bog; to cause to
   sink and stick, as in mud and mire.
   [1913 Webster]

         At another time, he was bogged up to the middle in the
         slough of Lochend.                       --Sir W.
                                                  Scott.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

bog \bog\ (b[o^]g), n. [Ir. & Gael. bog soft, tender, moist: cf.
   Ir. bogach bog, moor, marsh, Gael. bogan quagmire.]
   [1913 Webster]
   1. A quagmire filled with decayed moss and other vegetable
      matter; wet spongy ground where a heavy body is apt to
      sink; a marsh; a morass.
      [1913 Webster]

            Appalled with thoughts of bog, or caverned pit,
            Of treacherous earth, subsiding where they tread.
                                                  --R. Jago.
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   2. A little elevated spot or clump of earth, roots, and
      grass, in a marsh or swamp. [Local, U. S.]
      [1913 Webster]

   Bog bean. See Buck bean.

   Bog bumper (bump, to make a loud noise), Bog blitter,
   Bog bluiter, Bog jumper, the bittern. [Prov.]

   Bog butter, a hydrocarbon of butterlike consistence found
      in the peat bogs of Ireland.

   Bog earth (Min.), a soil composed for the most part of
      silex and partially decomposed vegetable fiber. --P. Cyc.

   Bog moss. (Bot.) Same as Sphagnum.

   Bog myrtle (Bot.), the sweet gale.

   Bog ore. (Min.)
      (a) An ore of iron found in boggy or swampy land; a
          variety of brown iron ore, or limonite.
      (b) Bog manganese, the hydrated peroxide of manganese.

   Bog rush (Bot.), any rush growing in bogs; saw grass.

   Bog spavin. See under Spavin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bog
    n 1: wet spongy ground of decomposing vegetation; has poorer
         drainage than a swamp; soil is unfit for cultivation but
         can be cut and dried and used for fuel [syn: bog, peat
         bog]
    v 1: cause to slow down or get stuck; "The vote would bog down
         the house" [syn: bog down, bog]
    2: get stuck while doing something; "She bogged down many times
       while she wrote her dissertation" [syn: bog down, bog]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "bog":
   baygall, bemire, bog down, bottom, bottomland, bottoms,
   buffalo wallow, cesspool, cloaca, cloaca maxima, drain, dump,
   everglade, fen, fenland, garbage dump, glade, hog wallow, holm,
   marais, marish, marsh, marshland, meadow, mere, mire, moor,
   moorland, morass, moss, mud, mud flat, peat bog, quag, quagmire,
   quicksand, salt marsh, septic tank, sewer, sink, sink in,
   slob land, slough, sough, stodge, sump, swale, swamp, swampland,
   taiga, wallow, wash