Synonyms of 'die away'
▷ See die
The sound died away.
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If something declines, it becomes less in quantity, importance, or strength.
a declining birth rate
The problem should disappear altogether by the age of five.
If something dwindles, it becomes smaller, weaker, or less in number.
The factory's workforce has dwindled.
Thesaurus for die away from the Collins English Thesaurus
If a sound dies away , it gradually becomes weaker or fainter and finally disappears completely.