decollate vs put on the block

decollate

verb
  • To behead. 

  • To separate the copies of a multipart computer printout. 

adj
  • Tapering to a blunt end. 

put on the block

verb
  • To execute by beheading. 

  • To sell something. 

How often have the words decollate and put on the block occurred in a corpus of books? (source: Google Ngram Viewer )