What does the idiom finished with their mean?

The idiom "finished with their" is not a common idiom in English. It seems like you might be trying to remember a different idiom or phrase.

Could you please provide more context or the full phrase you're thinking of? This will help me understand what you're looking for and provide a more accurate answer.

For example, are you thinking of:

* "Finished with them" - This could mean that someone is done with a particular task or relationship.

* "Finished with their work" - This means someone has completed their assigned tasks.

* "Finished with their lives" - This is a dramatic way to say someone has died.

Please provide more information so I can help you!