Related Clues:

• Gave away verbally
• Was a fink
• Wasn't discreet
• Spoiled the surprise
• "__ you so!"
• Gave away
• Was a snitch
• Broke the news
• Ratted (on)
• Squealed (on)
• Was unable to keep a secret
• Emulated a rat
• Was a ratfink
• Told (on): slang
• Turned informer