lay odds vs toss up

lay odds

verb
  • To offer a bet in which one stands more to lose than the opponent; or a bet in some other way favourable to the opponent. 

  • To feel certain about something. 

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. 

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