Related Clues:

• Ultimatum ender, often
• Or follower
• 'Do it or ___!'
• Beyond that
• It can come after no one or someone
• '… and I mean it!'
• Ultimatum closer
• Ultimatum end
• Last word of an ultimatum, perhaps
• ''Do it, or ___!''
• Where starter
• Ominous-sounding phrase
• ''Or ___!''
• See 21 Across
• Threat phrase