melt away
phrasal verb with melt verb uk/melt/ us/melt/
逐渐消失;逐渐散去
to disappear slowly
As the police sirens were heard, the crowd started to melt away. 警笛一响，人群就开始散开了。
（强烈的情绪）变弱，消失
If a strong feeling melts away, you feel it less strongly and it disappears.
Her anger melted away when she read the letter. 读到信时，她的怒火慢慢消失了。