180180 /wʌn ˈeɪti/ noun 
do a 180 informal a)to turn around so that you are then facing in the opposite direction, for example on a bicycle or a skateboard b)to completely change your attitude to something or your plans for something: 
They have done a 180 on the issue of immigration.
do a 180 informal a)to turn around so that you are then facing in the opposite direction, for example on a bicycle or a skateboard b)to completely change your attitude to something or your plans for something: They have done a 180 on the issue of immigration.