The Collaborative International Dictionary of English v.0.48:

Tattle \Tat"tle\, v. i. [imp. & p. p. Tattled; p. pr. & vb. n.
   Tattling.] [Akin to OE. tateren, LG. tateln, D. tateren to
   stammer, and perhaps to E. titter.]
   1. To prate; to talk idly; to use many words with little
      meaning; to chat.
      [1913 Webster]

            The tattling quality of age, which is always
            narrative.                            --Dryden.
      [1913 Webster]

   2. To tell tales; to communicate secrets; to be a talebearer;
      as, a tattling girl.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tattle \Tat"tle\, n.
   Idle talk or chat; trifling talk; prate.
   [1913 Webster]

         [They] told the tattle of the day.       --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tattle
    n 1: disclosing information or giving evidence about another
         [syn: tattle, singing, telling]
    v 1: speak (about unimportant matters) rapidly and incessantly
         [syn: chatter, piffle, palaver, prate, tittle-
         tattle, twaddle, clack, maunder, prattle, blab,
         gibber, tattle, blabber, gabble]
    2: divulge confidential information or secrets; "Be careful--his
       secretary talks" [syn: spill the beans, let the cat out of
       the bag, talk, tattle, blab, peach, babble,
       sing, babble out, blab out] [ant: keep one's mouth
       shut, keep quiet, shut one's mouth]