Related Clues:

• 'My word!'
• 'Golly!'
• Blow away
• 'Holy Toledo!'
• 'That's incredible!'
• Knock the socks off
• 'That's amazing!'
• Astound
• Knock over
• Super-duper success
• 'I'm impressed!'
• ''Amazing!''
• 'Impressive!'
• Knock 'em dead
• ''I'm impressed!''