japan vs rub down

japan

verb

  • To varnish with japan. 

noun

  • A hard black enamel varnish containing asphalt. 

  • Lacquerware. 

rub down

verb

  • To rub from top to bottom, e.g. for cleaning, stripping paint or massage. 

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