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.
   [1913 Webster]

         His salt tears trickled down as rain.    --Chaucer.
   [1913 Webster]

         Fast beside there trickled softly down
         A gentle stream.                         --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Trickle \Tric"kle\, n.
   The act or state of trickling; also, that which trickles; a
   small stream; drip.

         Streams that . . . are short and rapid torrents after a
         storm, but at other times dwindle to feeble trickles of
         mud.                                     --James Bryce.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

trickle
    n 1: flowing in drops; the formation and falling of drops of
         liquid; "there's a drip through the roof" [syn: drip,
         trickle, dribble]
    v 1: run or flow slowly, as in drops or in an unsteady stream;
         "water trickled onto the lawn from the broken hose";
         "reports began to dribble in" [syn: trickle, dribble,
         filter]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "trickle":
   a few, condensation, condense, distill, distillation, dribble,
   drip, dripping, drippings, dripple, drizzle, drop, exude, filter,
   flow, gurgle, handful, leach, leaching, leak, leak out, leakage,
   leaking, limited number, lixiviate, lixiviation, only a few, ooze,
   percolate, percolation, piddling few, piddling number, rivulet,
   run, runlet, runnel, scattering, seep, seepage, seeping,
   small number, spill, sprinkling, spurtle, sweat, sweating, too few,
   tricklet, trill, weep