4. 變弱; 逐漸消失：throw sb. off the trail 甩掉尾巴 | trail after 追隨 | trailoff 變弱; 逐漸消失
trail off詞典解釋
1. (聲音)逐漸減弱，越來(lái)越小 If a speaker's voice or a speaker trails off or trails away, their voice becomes quieter and they hesitate until they stop speaking completely.
e.g. 'But he had no reason. He of all men...' Kate's voice trailed off. “但是他沒(méi)有任何理由。在所有人當中…” 凱特的聲音越來(lái)越輕。