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Phrase(s): Marry in haste, (and) repent at leisure.
Prov. If you marry someone you do not know well, or decide to marry someone without first carefully considering what you are doing, you will probably regret it for a long time. • Sally wanted some time to consider Sam’s proposal of marriage; she had heard the saying, "Marry in haste, and repent at leisure."
McGrawhill's American Idioms And Phrasal Verbs