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Phrase(s): If you want peace, (you must) prepare for war.
Prov. If a country is well armed, its opponents will be less likely to attack it. • Wilbur was always arguing with those of his friends who believed in disarmament. "Getting rid of our weapons won’t promote peace," he would say. "If you want peace, you must prepare for war."
McGrawhill's American Idioms And Phrasal Verbs