The Collaborative International Dictionary of English v.0.48:

Bicker \Bick"er\, v. i. [imp. & p. p. Bickered; p. pr. & vb.
   n. Bickering.] [OE. bikeren, perh. fr. Celtic; cf. W. bicra
   to fight, bicker, bicre conflict, skirmish; perh. akin to E.
   beak.]
   1. To skirmish; to exchange blows; to fight. [Obs.]
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            Two eagles had a conflict, and bickered together.
                                                  --Holland.
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   2. To contend in petulant altercation; to wrangle.
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            Petty things about which men cark and bicker.
                                                  --Barrow.
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   3. To move quickly and unsteadily, or with a pattering noise;
      to quiver; to be tremulous, like flame.
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            They [streamlets] bickered through the sunny shade.
                                                  --Thomson.
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