japan vs rub up

japan

noun
  • A hard black enamel varnish containing asphalt. 

  • Lacquerware. 

verb
  • To varnish with japan. 

rub up

verb
  • To polish or scrub; to cover (something with a substance) by rubbing. 

  • To rub (a body part): to massage, give a massage to. 

  • To assault (someone). 

  • To create (something) by rubbing. 

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