incurvate vs straighten

incurvate

adj
  • bending inwards. 

  • Curved; bent; crooked. 

verb
  • to have a curved or bent shape; to bend or curve inwards. 

  • To bend (especially inwards); to give a curved shape to. 

straighten

verb
  • To clarify a situation or concept to (an audience). 

  • To bribe or corrupt. 

  • To stand up, especially from a sitting position. 

  • To cause to become straight. 

  • To become straight. 

  • To put in order; to sort; to tidy up. 

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