Blab (verb)

1. To reveal secret information carelessly.
2. To talk too much or too freely about something.

Origin:

The origin of the word blab is uncertain, it is first recorded in english in the 16th century. .

Examples:

1. She blabbed the secret to her friends.
2. He's always blabbing about his personal life.
3. Don't blab to anyone about this, its important that it stays a secret.
4. She had a blabbermouth and couldn't keep a secret.
5. He's always blabbing about his future plans.