fade away
phrasal verb with fade verb [ I or T ] uk/feɪd/ us/feɪd/
B2 逐渐消失；变得无足轻重；变弱
to slowly disappear, lose importance, or become weaker
The voices became louder and closer and then faded away again. 人声越来越嘈杂，越来越近，接着又逐渐消失了。
As the years passed, the memories faded away. 岁月流逝，那些记忆都淡忘了。