Related Clues:

• "Hey, Mister!"
• Clandestine signal
• "Excuse me . . ."
• "Pardon me"
• 'Beg pardon ...'
• Surreptitious sound
• 'Hi, sailor'
• "You, there!"
• "Hey, Mac!"
• "Howdy!"
• "Listen!"
• Bid for attention
• Captain's greeting
• Swabbie's salute
• On-board shout