Related Clues:

• Unspoken part of the Godfather's "offers"?
• Ominous phrase
• "Otherwise, you'll be sorry!"
• Threat's ending
• Bully's words
• Bullying words
• Unsettling last words
• "... otherwise, you'll be sorry!"
• Otherwise - that's a threat
• Otherwise - it's a threat
• Otherwise - may be threatening
• If not, then - sounds like a threat
• Do it . . . . . . - an informal warning
• If not, then - vaguely threatening
• End to a threat, perhaps