above-board vs man-to-man

above-board

adv
  • Honestly; openly. 

adj
  • In open sight; without trick, concealment, or deception. 

man-to-man

adv
  • directly, forthrightly, and honestly 

adj
  • one-on-one 

  • direct, forthright, and honest 

How often have the words above-board and man-to-man occurred in a corpus of books? (source: Google Ngram Viewer )