upswing vs upthrust

upswing

verb
  • To swing upward. 

noun
  • an upward swing 

  • an upward trend or an increase in activity 

upthrust

verb
  • To thrust something upwards. 

  • To be thrust upwards. 

noun
  • Buoyancy. 

  • An upward movement of part of the Earth's crust. 

  • An upward thrust. 

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