above-board vs on the up-and-up

above-board

adj

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

adv

  • Honestly; openly. 

on the up-and-up

adj

  • Legitimate; honest; upright. 

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