Related Clues:

• "Psst!" kin
• "May I have your attention" sound
• 'If I may interject ... '
• 'Shh!' relative
• "Shh!" relative
• Soft "ahem" alternative
• Library attention-getter
• "Can you keep a secret?" sound
• Wordless whisper
• Subtle "Excuse me . . ."
• Whispered version of ''Yoo-hoo!''
• "Hey" relative
• Throaty "beg pardon . . ."
• Sibilant "Yo!"
• Sound from a would-be test cheater