The Collaborative International Dictionary of English v.0.48:

Gargle \Gar"gle\, v. t. [imp. & p. p. Garggled, p. pr. & vb.
   n. Gargling (?).] [F. gargouiller to dabble, paddle,
   gargle. Cf. Gargoyle, Gurgle.]
   1. To wash or rinse, as the mouth or throat, particular the
      latter, agitating the liquid (water or a medicinal
      preparation) by an expulsion of air from the lungs.
      [1913 Webster]

   2. To warble; to sing as if gargling [Obs.] --Waller.
      [1913 Webster]