conflict vs one on one

conflict

noun
  • A clash or disagreement, often violent, between two or more opposing groups or individuals. 

  • An incompatibility, as of two things that cannot be simultaneously fulfilled. 

verb
  • To overlap (with), as in a schedule. 

  • To be at odds (with); to disagree or be incompatible 

one on one

How often have the words conflict and one on one occurred in a corpus of books? (source: Google Ngram Viewer )