sotto voce

adj, adv (Italian fml or joc 意, 文或谑) in a low voice, so as not to be heard by everyone 轻声（的）; 低声（的）: a sotto voce remark 轻声说出的话 * The defendant leant forward and spoke to his barrister, sotto voce. 被告探身跟讼务律师嘀咕了几句.

sorely, soreness, sorghum, sorority, sorrel, sorrow, sorrowful, sorrowfully, sorrowfulness, sorry, sorry-looking, sort, sort out, sort through, sorter, sortie, sorting, SOS, sot, sottish, sou, souffle, sough, sought, soul, soul brother (fem 阴性作 `soul sister), soul food, soul mate, soul music, soul-destroying, soul-searching, soul-stirring, soulful, soulfully, soulfulness, soulless, soullessly, sound, sound a warning, sound archives,