Related Clues:

• Subtler alternative to ''Yo!''
• Word often preceded by a color
• It may precede the sharing of a secret
• Subtle "Yo!"
• "Hey!"
• Forewarn
• Blow the horn at
• ''Hey, pal, over here!''
• Bring to the attention of
• On the lookout
• Informal conversation starter
• Like a watchdog
• 'Listen to that!'
• "Ahem!"
• "___! The Herald Angels Sing"