Related Clues:

• "What __?"
• A choice word
• "If all __ fails ..."
• Word before or after where
• Ultimatum ender, often
• Or follower
• 'Do it or ___!'
• Beyond that
• It can come after no one or someone
• Ultimatum end
• Last word of an ultimatum, perhaps
• ''Do it, or ___!''
• Where starter
• ''Or ___!''
• See 21 Across