For Set in Stone?

If an agreement, policy, or rule is set in stone, it is completely decided and cannot be changed. The exact terms of the scheme have yet to be set in stone.

What is the meaning of set in stone?

said to mean that something such as an agreement, policy or rule is not permanent and that it can be changed.

Is set in stone a idiom?

Idiom: 'Set in stone'

Meaning: If something is set in stone, it cannot be changed or altered.