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Phrase(s): The best defense is a good offense.
Prov. If you attack your opponents, they will be so busy fighting off your attack that they will not be able to attack you. (Often associated with sports. Often pronounced with the accent on the first syllable, similar to offense.) • The team mostly practiced offensive moves because the coach believed that the best defense is a good offense. • Jim thought that the best defense is a good offense, so he always tried to pass other drivers before they could pass him.
McGrawhill's American Idioms And Phrasal Verbs