The Collaborative International Dictionary of English v.0.48:

Flit \Flit\, v. i. [imp. & p. p. Flitted; p. pr. & vb. n.
   Flitting.] [OE. flitten, flutten, to carry away; cf. Icel.
   flytja, Sw. flytta, Dan. flytte. [root]84. Cf. Fleet, v.
   i.]
   1. To move with celerity through the air; to fly away with a
      rapid motion; to dart along; to fleet; as, a bird flits
      away; a cloud flits along.
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            A shadow flits before me.             --Tennyson.
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   2. To flutter; to rove on the wing. --Dryden.
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   3. To pass rapidly, as a light substance, from one place to
      another; to remove; to migrate.
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            It became a received opinion, that the souls of men,
            departing this life, did flit out of one body into
            some other.                           --Hooker.
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   4. To remove from one place or habitation to another. [Scot.
      & Prov. Eng.] --Wright. Jamieson.
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   5. To be unstable; to be easily or often moved.
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            And the free soul to flitting air resigned.
                                                  --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Flit \Flit\, a.
   Nimble; quick; swift. [Obs.] See Fleet.
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WordNet (r) 3.0 (2006):

flit
    n 1: a sudden quick movement [syn: flit, dart]
    2: a secret move (to avoid paying debts); "they did a moonlight
       flit"
    v 1: move along rapidly and lightly; skim or dart; "The
         hummingbird flitted among the branches" [syn: flit,
         flutter, fleet, dart]