1
general::
Phrase(s): fade down
[for sound] to diminish. • The roar of the train faded down as it passed and fled into the night. • As the thunder faded down, the sun began to break through the clouds., Phrase(s): fade something down
to turn down a sound. (Broadcasting.) • The radio engineer faded the music down and the announcer’s voice began. • She faded down the music.
McGrawhill's American Idioms And Phrasal Verbs