in contention vs up in the air

in contention

prep

  • Used other than figuratively or idiomatically: see in, contention. 

  • Contending for a title or championship. 

up in the air

adj

  • Not yet resolved, finished, answered, decided or certain. 

adv

  • Used other than figuratively or idiomatically: see up, in, the, air. 

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