变质坏掉
[biàn zhì huài diào]
“变质坏掉” (Going bad or turning sour) typically refers to food going stale, but when applied figuratively, this can mean deteriorating quality or losing one’s original good qualities, reflecting a negative transformation process in oneself, relationships, or surrounding environment. The user might express feelings of disillusionment or dissatisfaction towards changes they perceive around them.