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Sotto voce means intentionally lowering the volume of one's voice for emphasis. The speaker gives the impression of uttering involuntarily a truth which may surprise, shock, or offend. Galileo Galilei's (probably apocryphal) utterance "Eppur si muove " ("And yet [the Earth] moves"), spoken after deciding to recant his heliocentric theory, is a legendary example of a sotto voce utterance. Wikipedia