crack onto vs womanize

crack onto

verb
  • To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc. 

womanize

verb
  • To flirt with and/or seduce, or attempt to seduce, women, especially lecherously. 

  • To turn into a woman; to feminize. 

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