Polish vs idiom

Polish

noun
  • A breed of chickens with a large crest of feathers. 

  • The language spoken in Poland. 

adj
  • Of, from or native to Poland, or relating to the Polish language. 

idiom

noun
  • An artistic style (for example, in art, architecture, or music); an instance of such a style. 

  • A manner of speaking, a mode of expression peculiar to a language, language family, or group of people. 

  • An established phrasal expression whose meaning may not be deducible from the literal meanings of its component words. 

  • A programming construct or phraseology that is characteristic of the language. 

  • A language or language variety; specifically, a restricted dialect used in a given historical period, context etc. 

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