trail off

US /treɪl ɔf/
UK /treɪl ɔf/
"trail off" picture
1.

途切れる, 消え入る

If a speaker or their voice trails off, they stop speaking or the sound of their voice becomes weaker and weaker and then stops.

:
His voice trailed off as he realized his mistake.
彼は自分の間違いに気づくと、声が途切れた
The conversation trailed off into silence.
会話は途切れて沈黙になった。