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    To me it looks more like a variation of "run into the sand" which like "run onto the rocks" or "run ashore" is a maritime analogy - this time implying coming to a stop as if it were a ship beached on sand.
    – DotCounter
    Commented Dec 22, 2021 at 10:39
  • It could also be a motor racing metaphor: Race tracks have sand traps, to slow down and stop cars that go off the track. Hence "go into the sand" means "go off course in a way that permanently ends whatever you were trying to achieve.
    – James K
    Commented Dec 22, 2021 at 18:30