Related Clues:

• Didn't keep mum
• Sold (out)
• Gave the game away
• Notified
• "I ___ you so!"
• Couldn't keep a secret
• Imparted
• "__ you!"
• Let in on
• Took effect
• Sang like a canary, so to speak
• Betrayed like a rodent
• Betrayed or informed, the rodent
• Deserted the side, rodent-like
• Broke promise in treacherous or rodent style