"Sotto voce" is an Italian phrase that means to speak in a low or soft voice. It suggests whispering or speaking quietly, often used to convey something secretive or confidential. Full definition
Matt Miller, who says he has «slammed teachers unions plenty,» goes into somber mode and in sotto voce tells us in that there is a «deeper reality» that we all need to grapple with. (californiapolicycenter.org)
It might require a series of sotto voce conversations with the Secretary and a jointly signed public letter. (educationnext.org)
So inevitable are these conclusions, in fact, that I just gave up and accepted the ending, which sidesteps a first - glance case of double jeopardy with such vague dialogue, recited in such a bland tone of sotto voce, that I only got the basic gist of how we got from Point A to Point B. With Point B such a shrug - worthy certainty, I wasn't nearly confused enough to care besides. (filmfreakcentral.net)