The Collaborative International Dictionary of English v.0.48:

Jingle \Jin"gle\, n.
   1. A rattling, clinking, or tinkling sound, as of little
      bells or pieces of metal.
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   2. That which makes a jingling sound, as a rattle.
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            If you plant where savages are, do not only
            entertain them with trifles and jingles, but use
            them justly.                          --Bacon.
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   3. A correspondence of sound in rhymes, especially when the
      verse has little merit; hence, a rhyming verse of no
      poetical merit. " The least jingle of verse." --Guardian.

   Note: The verses used in commercial advertisements are often
         called jingles, especially when sung.
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   Jingle shell. See Gold shell
      (b), under Gold.
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