protract vs stall for time

protract

verb
  • To put off to a distant time; to delay; to defer. 

  • To draw out; to extend, especially in duration. 

  • To draw to a scale; to lay down the lines and angles of, with scale and protractor; to plot. 

  • To extend; to protrude. 

  • To use a protractor. 

stall for time

verb
  • To intentionally cause a delay; to stop; to wait. 

How often have the words protract and stall for time occurred in a corpus of books? (source: Google Ngram Viewer )