Lǎobǎn gěi le tā zuìhòu tōngdié, yāoqiú tā ànshí wánchéng.
The boss gave him an ultimatum, demanding he finish on time.
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history
通牒 originally referred to an official diplomatic note. Combined with 最后 ("final"), it became the standard Chinese term for "ultimatum," used in both diplomacy and everyday life.
