Related Clues:

• Astound
• Knock over
• You may be struck with it
• Super-duper success
• Surprise greatly
• 'I'm impressed!'
• Render speechless
• Leave open-mouthed
• Reaction to meeting one's idol
• ''Amazing!''
• Impress deeply
• 'Impressive!'
• Knock 'em dead
• ''I'm impressed!''
• 'That's really something!'