The Collaborative International Dictionary of English v.0.48:

Swish \Swish\, v. t. [From the sound. Cf. Swash.]
   1. To flourish, so as to make the sound swish. --Coleridge.
      [1913 Webster]

   2. To flog; to lash. [Slang] --Thackeray.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Swish \Swish\, v. i.
   To dash; to swash.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Swish \Swish\, n.
   1. A sound of quick movement, as of something whirled through
      the air. [Colloq.]
      [1913 Webster]

   2. (Naut.) Light driven spray. [Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

swish
    adj 1: elegant and fashionable; "classy clothes"; "a classy
           dame"; "a posh restaurant"; "a swish pastry shop on the
           Rue du Bac"- Julia Child [syn: classy, posh, swish]
    n 1: a brushing or rustling sound
    v 1: move with or cause to move with a whistling or hissing
         sound; "The bubbles swoshed around in the glass"; "The
         curtain swooshed open" [syn: lap, swish, swosh,
         swoosh]

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "swish":
   assibilate, assibilation, babble, bent, bubble, burble, buzz,
   campy, classy, crinkle, de rigueur, effeminate, effervesce,
   effervescence, effervescing, elegant, exclusive, fashionable, fizz,
   fizzle, fizzling, frication, frictional rustling, fruity, gay,
   guggle, gurgle, hiss, hissing, homosexual, hush, hushing, in,
   kinky, lap, lisp, plash, plush, posh, purl, queer, rhonchus,
   ripple, ritzy, rustle, shush, shushing, sibilance, sibilate,
   sibilation, siffle, sigmatism, siss, sissing, sizz, sizzle,
   sizzling, slosh, smart, sneeze, sneezing, sniff, sniffle, snore,
   snort, snuff, snuffle, spit, splash, splutter, sputter, squash,
   squelch, squish, sternutation, stertor, stylish, susurrate, swank,
   swanky, swash, swell, tony, trendy, trill, wash, wheeze, whish,
   whisk, whisper, whistle, whistling, white noise, whiz, whoosh,
   with-it, zip



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

SWISH
       Simple Web Indexing System for Humans (WAIS, WWW)