trail off
US /treɪl ɔf/
UK /treɪl ɔf/

1.
затихать, обрываться
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.
Его голос затих, когда он осознал свою ошибку.
•
The conversation trailed off into silence.
Разговор затих в тишине.