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Phrase(s): The end justifies the means.
Prov. You can use bad or immoral methods as long as you accomplish something good by using them. (Not everyone agrees with this idea.) • Lucy got money for the orphanage by embezzling it from the firm where she worked. "The end justifies the means," she told herself. • The politician clearly believed that the end justifies the means, since he used all kinds of nefarious means to get elected.
McGrawhill's American Idioms And Phrasal Verbs