bidding vs reversal

bidding

noun
  • The act of placing a bid. 

  • That which one is bidden to do; a command. 

reversal

noun
  • A change in fortune; a change from being successful to having problems. 

  • An instance of reversing. 

  • The state of being reversed. 

adj
  • Intended to reverse; implying reversal. 

How often have the words bidding and reversal occurred in a corpus of books? (source: Google Ngram Viewer )