toss up vs wager

toss up

verb
  • To make a decision based on chance, for example by flipping a coin or rolling a dice. 

  • To produce, generate. 

  • To casually mention as an idea. 

  • To vomit. 

  • To beat up, thrash. 

  • To cook something quickly. 

  • To throw something upwards. 

wager

verb
  • To bet something; to put it up as collateral. 

  • To suppose; to dare say. 

noun
  • Something deposited, laid, or hazarded on the event of a contest or an unsettled question; a bet; a stake; a pledge. 

  • An offer to make oath. 

  • A contract by which two parties or more agree that a certain sum of money, or other thing, shall be paid or delivered to one of them, on the happening or not happening of an uncertain event. 

  • That on which bets are laid; the subject of a bet. 

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