to go downhill, to go to ruin, to fail
Scheitern, misslingen oder in einem schlechten Zustand geraten.
To deteriorate, to fail, or to go into decline.
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Ohne neue Investitionen wird das Projekt den Bach runtergehen.— Without new investments, the project will go downhill.
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Seine Karriere ist leider völlig den Bach runtergegangen.— His career has unfortunately completely gone to ruin.