rake over old coals.

To bring up past arguments, grievances, or painful events again, especially when doing so seems unhelpful.

Use it for

Words that belong together

• keep raking over old coals
• no point raking over old coals

On the page

There's no point raking over old coals now that we've agreed how to move forward.

Usage notes

Lexical Type: Idiom. Every future addition must be classified at creation. Commonness: moderately common. Idiom grammar is described in Usage Notes 1; no artificial whole-phrase conjugations are stored.