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Phrase(s): Marriages are made in heaven.
Prov. You cannot foretell who will marry whom.; Two people may love each other very much but may end up not marrying each other, and two people who do not even know each other may marry each other in the end. • Tom and Eliza were childhood sweethearts, had a happy family, and now are celebrating their fiftieth wedding anniversary. Marriages are made in heaven.
McGrawhill's American Idioms And Phrasal Verbs