From Longman Dictionary of Contemporary Englishmelt away phrasal verb1 if a crowd of people melts away, the people gradually leave The demonstrators melted away at the first sign of trouble.2 to gradually disappear Her determination to take revenge slowly melted away. → melt→ See Verb table
Examples from the Corpus
melt away• The excitement of the arrest was over and the crowd began to melt away.• And in a moment, 48 years melt away.• When money can be moved instantly on a personal computer, the whole idea of capital controls melts away.• When he approached the briar hedge, it melted away and be-came a flowering path.• This makes everything melt away into the background.• He looked back, briefly, but Kirov had already melted away into the darkness.• The throng in front of Owen melted away, leaving his men exposed, so he drew them back into the shadows. 