trail off

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

渐渐消失, 逐渐减弱

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.
他意识到自己的错误时,声音渐渐消失了
The conversation trailed off into silence.
谈话渐渐消失在沉默中。