The Collaborative International Dictionary of English v.0.48:

Bubble \Bub"ble\, v. i. [imp. & p. p. Bubbled; p. pr. & vb. n.
   Bubbling.] [Cf. D. bobbelen, Dan. boble. See Bubble, n.]
   1. To rise in bubbles, as liquids when boiling or agitated;
      to contain bubbles.
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            The milk that bubbled in the pail.    --Tennyson.
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   2. To run with a gurgling noise, as if forming bubbles; as, a
      bubbling stream. --Pope.
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   3. To sing with a gurgling or warbling sound.
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            At mine ear
            Bubbled the nightingale and heeded not. --Tennyson.
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