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Phrase(s): If you run after two hares, you will catch neither.
Prov. You cannot do two things successfully at the same time. • Vanessa: If I want to pursue my acting career, I’ll have to take more days off to go to auditions. But I want to get ahead in the office, too. Jane: If you run after two hares, you will catch neither.
McGrawhill's American Idioms And Phrasal Verbs