To fade away is to grow gradually weaker until gone. The sound faded away.
The gradualness is the point, since nothing fades away suddenly. Old soldiers never die, they simply fade away, is the line everybody knows it from.
1phrasefade awayTo grow gradually weaker until gone.
“The pain would fade away over about a fortnight.”
fade away is a phrase.
Practised in Phrasal Verbs