revert to something
phrasal verb with revert verb uk/rɪˈvɜːt/ us/rɪˈvɝːt/
C2 回到，恢复，重提（不好的或令人不满意的事情）
to return to doing, using, being, or referring to something, usually something bad or less satisfactory
Why does the conversation have to revert to money every five minutes? 为什么话题每5分钟就会回到钱上去？
[ + -ing verb ] When they divorced, she reverted to using her maiden name. 他们离婚后，她恢复使用自己的娘家姓。