Keywords: about-turn, about-face, turn-around
As a Noun
A complete change in attitude or opinion. English = about-turn, about-face.
A complete change in circumstances. English = turn-around.
As a Verb or Adjective
To completely change your attitude or opinion about something.
To be confused, (be) surprised, (be) thrown off balance or be disoriented, especially by a complete and unexpected change in circumstances.