trail off

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

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

:
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His voice trailed off as he realized his mistake.
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The conversation trailed off into silence.
:
fade awaypeter outdie awaydwindlesubside
:
trailaudit trailblaze a trailpaper trailoffoff and onswitch off