Related Clues:

• Yak
• Let the cat out of the bag
• Talk too much
• Divulge
• Be loose-lipped
• Not keep secret
• Not keep to oneself
• Sing, so to speak
• Say too much
• Reveal indiscreetly
• Tells tales
• Divulge a secret
• Give everything away
• De-bag the cat?
• Talk, talk, talk ...