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Phrase(s): *a leg up on someone
Fig. an advantage that someone else does not have. (*Typically: get ~; have ~; give someone ~.) • I have a leg up on Walter when it comes to getting around town, since I have a car. • I want to practice indoors all winter and get a leg up on Ken, since he thinks he can beat me at tennis.
McGrawhill's American Idioms And Phrasal Verbs