above-board vs up front

above-board

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

adv
  • Honestly; openly. 

up front

adj
  • Open, honest; tending to disclose information; truthful. 

adv
  • At the beginning; before anything begins. 

  • At the front. 

  • In an attacking position. 

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