Verb
trail off (third-person singular simple present trails off, present participle trailing off, simple past and past participle trailed off)
Of a phenomenon, voice, etc.: to slowly diminish in frequency, intensity, or volume; also, to diminish more quickly over time.
Synonyms: peter, peter out
“So that’s why I’m, uh, refusing … uh, to do that …” He trailed off as he saw Mr. Winchester’s disapproving stare.
Often he would trail off with fans who came backstage after a show and go off with them to a party or something. He judged people as they were and if they invited him and he was in the right mood to go, he went. We used to call him 'Bon the Likeable. Bon Scott
I tend to be rather inconsequential and trail off. Edward Gorey