above-board vs self-denying

above-board

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

adv
  • Honestly; openly. 

self-denying

adj
  • Without concern for one's own advantage; selfless or self-sacrificing. 

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