set in stone

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set in stone

1. (idiomatic) Permanent; certain; firm.

   The decision won't be set in stone until we release the documents.

• written in stone
• carved in stone

set in stone (third-person singular simple present sets in stone, present participle setting in stone, simple past and past participle set in stone)

1. To render something permanent, certain, or firm.

   The plan looks good, but don't set it in stone until we have discussed it a bit more.