To blather; to talk foolishly or incoherently.
To blab; to reveal a secret.
A person who blabs; a tattler; a telltale.
To act as a tattletale; to tell on; to give away, reveal, or expose.
telltale; giveaway
One who tattles (reports others' wrongdoings), often a child seeking attention.
One who gossips, often for the sake of attention.