boondock vs brush up

boondock

verb
  • To camp in a dry brushy location. 

  • To stay in a self-contained recreational vehicle without connections to water, electricity, or sewer services, especially in a remote location. 

  • To strike a squopped wink and send it flying far away. 

noun
  • A brushy, rural area or location. 

  • A shot that strikes a squopped wink and sends it flying far away. 

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 boondock and brush up occurred in a corpus of books? (source: Google Ngram Viewer )