ultimatum

Definition

A final, uncompromising demand whose refusal triggers severe consequences.

A stern, non-negotiable proposition issued as a last warning, often in tense conflicts, where compliance is demanded or retaliation ensues, heightening stakes dramatically.

In Context

“As warships massed in the Strait of Hormuz, Trump's ultimatum to Iran—to reopen the vital waterway or face strikes on its power grid—left the world holding its breath amid fragile peace talks.”