cross-examination vs legwork

cross-examination

noun
  • The interrogation or questioning of a witness by the party against whom they have been called and examined, in an attempt to prove or reveal something false or untold during direct examination. 

  • Any intense period of questioning, especially if hostile. 

legwork

noun
  • Skillful or vigorous use of the legs, as in dance or sports. 

  • Work, especially research or preparation, that involves significant walking, travel, or similar effort. 

How often have the words cross-examination and legwork occurred in a corpus of books? (source: Google Ngram Viewer )