bottom out vs swap places

bottom out

verb
  • To reach the bottom; to reach the nadir or lowest point. 

  • To strike the lower mechanical stop and lose the ability to buffer further downward motion. 

  • Of a vessel, to touch the bottom of a water body. 

  • Of a wheeled vehicle, to touch or drag along the ground. 

swap places

verb
  • Synonym of change places 

How often have the words bottom out and swap places occurred in a corpus of books? (source: Google Ngram Viewer )