The Collaborative International Dictionary of English v.0.48:

Trickle \Tric"kle\ (tr[i^]k"k'l), v. i. [imp. & p. p. Trickled
   (tr[i^]k"k'ld); p. pr. & vb. n. Trickling
   (tr[i^]k"kl[i^]ng).] [OE. triklen, probably for striklen,
   freq. of striken to flow, AS. str[imac]can. See Strike, v.
   t.]
   To flow in a small, gentle stream; to run in drops.
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         His salt tears trickled down as rain.    --Chaucer.
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         Fast beside there trickled softly down
         A gentle stream.                         --Spenser.
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