falling out vs political opposition

falling out

noun
  • A rift between people or groups, often following a disagreement or quarrel 

  • A culture-bound syndrome primarily reported in the southern United States and the Caribbean, described as a constricted consciousness as a psychological response to anxiety and stress. 

political opposition

noun
  • Actions by one political group against another political group, either by using governmental power or by popular actions such as protests; generally, disagreement in politics. 

  • A recognized political party or group of parties in multiparty political systems that is present in Parliament or some other legislative body and does not control the floor (usually due to being in the minority). 

  • An unrecognized political party in a one-party state. 

How often have the words falling out and political opposition occurred in a corpus of books? (source: Google Ngram Viewer )