Related Clues:

• Comment before 'I don't know'
• Knock the socks off
• 'That's amazing!'
• Opposite of 1-Down
• Astound
• Knock over
• Super-duper success
• 'I'm impressed!'
• Word before 'I don't know'
• 'Goodness!'
• ''Wow!''
• Sound of surprise
• ''Amazing!''
• 'Impressive!'
• Knock 'em dead