above-board vs fair dinkum

above-board

adv

  • Honestly; openly. 

adj

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

fair dinkum

adv

  • Truly, honestly. 

adj

  • Genuine, honest, fair and square. 

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