Kept his voice down - Idioms by The Free Dictionary
keep (one's) voice down (redirected from kept his voice down)
keep (one's) voice down
To speak in a hushed voice or a whisper; to refrain from speaking too loudly. Shh! Keep your voices down! My parents are sleeping upstairs. I don't care if he was keeping his voice down—he shouldn't have been talking during the movie at all!
keep your ˈvoice down used to tell somebody to speak more quietly: Keep your voices down, won’t you? The children are asleep.
References in periodicals archive
Koizumi softened his response and kept his voice down
, without any shouting.
Poignantly, he kept his voice down
and spoke as little as possible while in the hospital because he was Irish, having been born in County Roscommon in the Republic.