Set in stone

adj, verb

Definitions

Adjective
  1. 1
    Permanent; certain; firm. idiomatic

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

Adjective
  1. 1
    no longer changeable wordnet
Verb
  1. 1
    To render something permanent, certain, or firm. idiomatic, transitive

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

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