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Phrase(s): hang a left
Inf. to turn left. • He hung a left at the wrong corner. • Hey, here! Hang a left here!
McGrawhill's American Idioms And Phrasal Verbs
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Also, hang a right. Make a left (or right) turn, as when driving an automobile. For example, Hang a left at the traffic light and then hang a right at the next intersection. [Slang; mid-1900s]
American Heritage Idioms