above-board vs surely

above-board

adv
  • Honestly; openly. 

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

surely

adv
  • With confidence. 

  • Certainly, undoubtedly. 

  • Without fail. 

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