The Collaborative International Dictionary of English v.0.48:

Swim \Swim\, v. i. [imp. Swamor Swum; p. p. Swum; p. pr. &
   vb. n. Swimming.] [AS. swimman; akin to D. zwemmen, OHG.
   swimman, G. schwimmen, Icel. svimma, Dan. sw["o]mme, Sw.
   simma. Cf. Sound an air bladder, a strait.]
   1. To be supported by water or other fluid; not to sink; to
      float; as, any substance will swim, whose specific gravity
      is less than that of the fluid in which it is immersed.
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   2. To move progressively in water by means of strokes with
      the hands and feet, or the fins or the tail.
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            Leap in with me into this angry flood,
            And swim to yonder point.             --Shak.
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   3. To be overflowed or drenched. --Ps. vi. 6.
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            Sudden the ditches swell, the meadows swim.
                                                  --Thomson.
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   4. Fig.: To be as if borne or floating in a fluid.
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            [They] now swim in joy.               --Milton.
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   5. To be filled with swimming animals. [Obs.]
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            [Streams] that swim full of small fishes. --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Swimming \Swim"ming\, n.
   The act of one who swims.
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The Collaborative International Dictionary of English v.0.48:

Swimming \Swim"ming\, a. [From Swim to be dizzy.]
   Being in a state of vertigo or dizziness; as, a swimming
   brain.
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The Collaborative International Dictionary of English v.0.48:

Swimming \Swim"ming\, n.
   Vertigo; dizziness; as, a swimming in the head. --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Swimming \Swim"ming\, a.
   1. That swims; capable of swimming; adapted to, or used in,
      swimming; as, a swimming bird; a swimming motion.
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   2. Suffused with moisture; as, swimming eyes.
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   Swimming bell (Zool.), a nectocalyx. See Illust. under
      Siphonophora.

   Swimming crab (Zool.), any one of numerous species of
      marine crabs, as those of the family Protunidae, which
      have some of the joints of one or more pairs of legs
      flattened so as to serve as fins.
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WordNet (r) 3.0 (2006):

swimming
    adj 1: filled or brimming with tears; "swimming eyes"; "sorrow
           made the eyes of many grow liquid" [syn: liquid,
           swimming]
    2: applied to a fish depicted horizontally [syn: naiant,
       swimming]
    n 1: the act of swimming; "it was the swimming they enjoyed
         most": "they took a short swim in the pool" [syn:
         swimming, swim]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "swimming":
   Australian crawl, Rugby, acrobatics, agonistics, aquaplaning,
   aquatic, aquatics, association football, athletics, backstroke,
   balneal, balneation, bathe, bathing, breaststroke, butterfly,
   crawl, deep-sea, diving, dizziness, dizzy, dog paddle, drunken,
   drunkenness, estuarine, fin, fishtail, flapper, flipper, floating,
   fluctuating, giddiness, giddy, grallatorial, gymnastics, light,
   light-headed, lightheaded, lightheadedness, littoral, natant,
   natation, natatorial, natatory, palaestra, rugger, seashore, shore,
   sidestroke, soccer, spinning head, sports, surfboarding, surfing,
   swaying, swim, tidal, tiddly, track, track and field,
   treading water, tumbling, turned around, vertiginous,
   vertiginousness, vertigo, wading, water-dwelling, water-growing,
   water-living, water-loving, waterskiing, wavering, wooziness