180 vs about-turn

180

noun
  • A complete change of direction or opinion. 

  • The friendly welcome was a 180 from what she had been expecting 

  • The exact opposite. 

  • An instance of spinning 180 degrees, so that one is facing in the opposite direction. 

about-turn

noun
  • Total reversal of opinion or attitude. 

  • A turn of 180 degrees, typically in a military formation. 

verb
  • To turn 180 degrees, typically in a military formation. 

How often have the words 180 and about-turn occurred in a corpus of books? (source: Google Ngram Viewer )