Related Clues:

• Ratted
• Gave away verbally
• Was a fink
• Wasn't discreet
• Told all
• Spoiled the surprise
• "__ you so!"
• Gave away
• Broke the news
• Ratted (on)
• Was unable to keep a secret
• Emulated a rat
• Was a ratfink
• Didn't keep mum
• Gave the game away