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3. be built on sand

be built on sand

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be built on sand

To be unstable. A relationship based entirely on physical attraction is built on sand and won't last long.

See also: built, on, sand

be built on sand

if something is built on sand, it is not firmly established and is likely to fail They seem quite happy now but I have a feeling that this marriage is built on sand.

See also: built, on, sand