Related Clues:

• Knock the socks off
• 'That's amazing!'
• Leave speechless
• Astound
• Knock over
• Super-duper success
• Surprise greatly
• 'I'm impressed!'
• Render speechless
• Leave open-mouthed
• ''Amazing!''
• 'Impressive!'
• Knock 'em dead
• ''I'm impressed!''
• 'That's really something!'