Related Clues:

• Paged
• Tried to contact
• Honked
• Hit the horn
• Summoned, in a way
• Went off, as a timer
• Went off like a smoke detector
• Tooted the horn
• Said "I'm done," microwave-style
• Warned, in a way
• Reached someone on a pager
• Went off like a microwave
• Tooted
• Emitted a backup signal?
• Alerted, in a way