# cast in concrete

idiom

Source: https://englishreference.com/idiom/cast-in-concrete
Updated: 2026-08-10

## Meaning

solidly established, very difficult to alter

## Examples

- Our plans for the weekend are not cast in concrete.
- The schedule for the project is flexible and not cast in concrete, so we can change it if necessary.
- Although the board presented the new policy as a final decision, they later admitted that nothing was cast in concrete.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.