What does carved in stone mean?

"Carved in stone" is an idiom meaning something that is permanent, unchangeable, or very difficult to alter. It's often used to emphasize the finality or immutability of a situation, decision, or belief.

Here's why:

* Stone is durable: Stone is a very hard material that resists weathering and time, making it a symbol of permanence.

* Carving is lasting: Carving is a method of shaping stone that creates intricate and durable designs.

Therefore, "carved in stone" suggests that something is as fixed and unchanging as a carving on a stone monument.

Examples:

* "The company's new policy is carved in stone, so don't even think about asking for an exception."

* "Her decision to move to the city was carved in stone, and nothing could change her mind."

* "The history books are carved in stone, so we can't rewrite the past."

In essence, "carved in stone" highlights the permanence and unchangeableness of a situation, idea, or decision.