Related Clues:

• 'Oh, cool!'
• "Hmm ..."
• "At last it's clear!"
• Therapist's comment
• Horse command
• "I'm impressed"
• ''Now you're making sense''
• Head of government?
• "Gosh"
• 'Aw, --!'
• Acknowledgment phrase
• "How interesting"
• 'Roger that'
• Thing that begins gradually?
• 'Wow, I didn't know that!'