风吹半茶凉
[fēng chuī bàn chá liáng]
'Breeze Blows, Leaving Half Cup of Cold Tea' vividly describes the change from warm to cold tea caused by a breeze blowing across half of it. It metaphorically refers to changes in personal emotions brought about by fleeting things like time, implying certain sadness over things changing too fast and becoming estranged.