Plural of aposiopesis; sudden breaks or pauses in speech, where a speaker deliberately trails off or stops abruptly, often for dramatic or emotional effect.
From Greek aposiopesis (becoming silent), from aposiōpan (to be silent), from apo- (away) + siōpē (silence). The term emerged in rhetoric to describe this stylistic device.
When Shakespeare writes 'I dare not name him, he were too powerful—' and just stops, that's aposiopesis, and it's one of the most powerful dramatic techniques because it lets your imagination fill in what's too dangerous or painful to say out loud.
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