POST vs brush up

POST

verb
  • To successfully perform a power-on self-test. 

noun
  • An HTTP request method used to send an arbitrary amount of data to a web server. 

brush up

verb
  • To paint, or make clean or bright with a brush. 

  • To review; to improve an existing but rusty or underdeveloped skill. 

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