Related Clues:

• Cannonball Adderley's 'Somethin' ___'
• ''What ___ could go wrong?''
• Bully's last words
• Threatening term
• Words often accompanied by a 45-Across
• Metallica's "Nothing __ Matters"
• ''... if you want to avoid trouble''
• Ominous words
• ''Or ___!'' (threat ender)
• It can come after ''no one'' or ''someone''
• 'That's something ___'
• Threatening ending
• ''What __ is new?''
• Final word in a threat
• "Do it or ___!"