Source : Webster's Revised Unabridged Dictionary (1913)

Tattle \Tat"tle\, n.
   Idle talk or chat; trifling talk; prate.

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

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.

            The tattling quality of age, which is always
            narrative.                            --Dryden.

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

Source : WordNet®

tattle
     v 1: speak (about unimportant matters) rapidly and incessantly
          [syn: {chatter}, {piffle}, {palaver}, {prate}, {tittle-tattle},
           {twaddle}, {clack}, {maunder}, {prattle}, {blab}, {gibber},
           {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}, {blab}, {peach}, {babble},
         {sing}, {babble out}, {blab out}] [ant: {keep quiet}]

tattle
     n : disclosing information or giving evidence about another
         [syn: {singing}, {telling}]