The Collaborative International Dictionary of English v.0.48:

Swig \Swig\, n.
   1. A long draught. [Colloq.] --Marryat.
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   2. (Naut.) A tackle with ropes which are not parallel.
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   3. A beverage consisting of warm beer flavored with spices,
      lemon, etc. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Swig \Swig\, v. t. [Cf. Prov. E. swig to leak out, AS.
   sw[imac]jian to be silent, sw[imac]can to evade, escape.]
   1. To castrate, as a ram, by binding the testicles tightly
      with a string, so that they mortify and slough off. [Prov.
      Eng.]
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   2. (Naut.) To pull upon (a tackle) by throwing the weight of
      the body upon the fall between the block and a cleat.
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The Collaborative International Dictionary of English v.0.48:

Swig \Swig\, v. t. [Cf. D. zwelgen to swallow, E. swallow, v.t.]
   1. To drink in long draughts; to gulp; as, to swig cider.
      [Colloq.]
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   2. To suck. [Obs. or Archaic]
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            The lambkins swig the teat.           --Creech.
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WordNet (r) 3.0 (2006):

swig
    n 1: a large and hurried swallow; "he finished it at a single
         gulp" [syn: gulp, draft, draught, swig]
    v 1: strike heavily, especially with the fist or a bat; "He
         slugged me so hard that I passed out" [syn: slug, slog,
         swig]
    2: to swallow hurriedly or greedily or in one draught; "The men
       gulped down their beers" [syn: gulp, quaff, swig]