In a word, turn over old scores.

The original intention of "turning over old accounts" is that business personnel will compare the accounts recorded in the account books within a fixed period of time to see if there is any discrepancy with the actual situation.

Extended meaning: refers to people who are worried about others' past and tell what others have done, made mistakes, won praises and experienced hardships. Remind or warn others again. It may also be like a third party telling other people's past events to achieve the purpose of informing.