trail off

English

Verb

trail off (third-person singular simple present trails off, present participle trailing off, simple past and past participle trailed off)

(of a voice or phenomenon) To slowly diminish in intensity, volume or frequency; thus, to diminish more quickly over time.
"So that's why I'm, uh, refusing... uh, to do that..." He trailed off as he saw Mr. Winchester's disapproving stare.

Translations

slowly diminish in intensity, volume