do a one-eighty

(redirected from turn one hundred and eighty degrees)

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.