Related Clues:

• Not just 'no!'
• Emphatic refusal
• 'In your dreams!'
• Shout of disapproval
• Authority-defying dare
• Schoolyard challenge
• "When pigs fly!"
• "Not gonna happen"
• Not in a month of Sundays
• Playground rebuttal
• When pigs fly
• "Not a chance!"
• At no time
• "Fat chance!"
• Half a fictional land