1. a final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations

Examples

• The union issued an ultimatum demanding higher wages or they would strike.
• She gave her roommate an ultimatum: clean up or move out.
• The country delivered an ultimatum to its neighbor to withdraw troops within 24 hours.
• His parents presented him with an ultimatum about improving his grades.
• The company’s ultimatum left employees with no choice but to accept the new terms.
• After months of negotiations, they finally issued their ultimatum.
• The ultimatum created tension between the two nations.