expression, godan verb (-su)
muffle one's voice; speak quietly; sob quietly
Used when someone deliberately suppresses their voice to avoid being heard, often in emotional or secretive situations.
彼女は声を殺して泣いていた。
She was crying quietly, muffling her sobs.
誰かに聞かれないように声を殺して話
I spoke in a muffled voice so that no one would hear.