# build on sand

idiom

Source: https://englishreference.com/idiom/build-on-sand
Updated: 2026-08-10

## Meaning

To put something in an unstable position by failing to give it a secure foundation.

## Examples

- Their new business plan is built on sand.
- A relationship built on sand rarely lasts for very long.
- You build your future on sand when you ignore your health.
- Because they ignored the basic legal requirements, the entire project was built on sand and soon collapsed.
- If you try to learn advanced physics without understanding basic math, your knowledge is built on sand and will eventually fail you.
- The manager realized the department's success was built on sand because it relied entirely on a single client who might leave.
- The software company discovered their new app was built on sand after the main server crashed during the first week.
- By basing his entire political platform on empty promises rather than concrete policy, the candidate ensured his campaign was built on sand.

## Origin

From the Parable of the Wise and the Foolish Builders in Matthew 7:24–27. The imagery concerns the inherent instability of a structure raised without a foundation, specifically contrasting one built upon rock with one built upon sand.

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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.