Related Clues:

• ''Hey, you . . .''
• Title for Isaac Newton
• Title for a knight
• General's address
• Chivalrous title
• Address for a man
• Word for a male superior
• ''Hey, Buddy!''
• Discreet summons
• Attention-getting whisper
• Sound for attention
• 'Little ___ Echo'
• "Yo!" in the library
• Title for Walter Scott
• Formal greeting