uphold vs upthrust

uphold

verb
  • To hold up; to lift on high; to elevate. 

  • To keep erect; to support; to sustain; to keep from falling 

  • To support by approval or encouragement, to confirm (something which has been questioned) 

upthrust

verb
  • To be thrust upwards. 

  • To thrust something upwards. 

noun
  • Buoyancy. 

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

  • An upward thrust. 

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