Related Clues:

• Joyous shout
• "Not in this lifetime!"
• 'Not gonna happen'
• "Not in a million years!"
• Part 2 of today's quote
• Chief ___ (controversial baseball mascot)
• Alternative for now
• Cowboy yell
• Oater cry
• 'Not a chance!'
• With 39-Across and 49-Across, rule broken by the three theme entries' first and last two letters
• Exultant yell
• Word seen on both sides of ''say''
• Under no circumstances
• Western cry