set in stone

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set in stone

1. (idiomatic) Permanent; certain; firm.

   Synonyms: carved in stone, written in stone

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

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. (transitive, idiomatic) 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.