jack up vs lessen

jack up

verb
  • To ruin; wreck; mess up; screw up; sometimes as a bowdlerized substitution for fuck up. 

  • To raise, hoist, or lift a thing using a jack, or similar means. 

  • To raise, increase, or accelerate; often said of prices, fees, or rates. 

  • To organise something. 

  • To shoot, especially in the context of a poor shot opportunity. 

lessen

verb
  • To make less; to diminish; to reduce. 

  • To become less. 

conj
  • unless. 

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