fade away
To slowly become less noticeable or significant. As the song faded away, the audience leapt to their feet and cheered for an encore. The line for the ride was so long that my excitement had completely faded away by the time we reached the front of it.
fade away
(into something) 1. . to diminish into something. The light faded away into nothing. The sound of the drums faded away into the distance.
2. Go to fade out.
fade away
v. To dissipate or fade slowly and completely: As I got older, my memories faded away.