set in stone

Definition

Permanent; certain; firm.

Example Sentences

• "The decision won't be set in stone until we release the documents."
• "So what is it that makes SBB (Swiss national railways) tick? In my humble opinion, two things. Firstly, a comprehensive and set-in-stone integrated timetable (incorporating trains, ferries, cable cars and buses, including the world-famous yellow 'post-autos'), compiled four years in advance and which gets tested twice before it becomes operational."