Related Clues:

• Come again, though only occasionally
• 'I don't get it'
• “Say what?”
• ''Beg pardon?'' but way less formal
• "What the?"
• "Uhh ... wha?"
• I didn't hear that business heartlessly made a profit
• 15 return
• "I didn't catch that"
• Storekeeper's request (2 words)