tattle

Short definition from Wiktionary

Verb

1. 1
   To chatter; to gossip.
2. 2
   Often said of children: to report incriminating information about another person, or a person's wrongdoing in an annoying fashion, usually to a person in a position of authority over the accused person; to tell on somebody.
3. 3
   To speak like a baby or young child; to babble, to prattle; to speak haltingly; to stutter.

Noun

1. 1
   A tattletale.
2. 2
   Often said of children: a piece of incriminating information or an account of wrongdoing that is said about another person.
3. 3
   Idle talk; gossip; (countable) an instance of such talk or gossip.