end in tears
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it'll (all) end in tears
Something is doomed to fail and cause a lot of heartache to everyone involved. I just don't think your personalities are a good match; I'm afraid it'll all end in tears. Everyone knew that their business venture would end in tears.
end in tearshave an unhappy or unpleasant outcome (often used as a warning). British
1992 Iain Banks The Crow Road Well, let them get married. The earlier the better; it would end in tears. Let them rush into it, let them repent at leisure.