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Phrase(s): do a one-eighty [and] turn one hundred and eighty degrees
1. Lit.to turn around and go in the opposite direction. • When I hollered, the dog did a one-eighty and headed back to its own yard. 2. Fig. to radically reverse a decision or opinion. • His political philosophy turned one hundred and eighty degrees when he grew a little older.
McGrawhill's American Idioms And Phrasal Verbs