allow vs rule out

allow

verb
  • To render physically possible. 

  • To not bar or obstruct. 

  • To grant, give, admit, accord, afford, or yield; to let one have. 

  • To acknowledge; to accept as true; to concede; to accede to an opinion. 

  • To grant license to; to permit; to consent to. 

  • To grant (something) as a deduction or an addition; especially to abate or deduct. 

  • To take into account by making an allowance. 

  • To decide (a request) in favour of the party who raised it; to grant victory to a party regarding (a request). 

rule out

verb
  • To make something impossible. 

  • To reject an option from a list of possibilities. 

  • To disallow. 

  • To cross an item out by drawing a straight line through it, as with a ruler. 

  • To make unavailable. 

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