career vs go hell for leather

career

noun
  • General course of action or conduct in life, or in a particular part of it. 

  • One's calling in life; a person's occupation; one's profession. 

  • A jouster's path during a joust. 

  • The flight of a hawk. 

adj
  • Synonym of serial (“doing something repeatedly or regularly as part of one's lifestyle or career”) 

verb
  • To move rapidly straight ahead, especially in an uncontrolled way. 

go hell for leather

How often have the words career and go hell for leather occurred in a corpus of books? (source: Google Ngram Viewer )