retool vs spruce up

retool

verb
  • To adjust; to optimize; to rebuild. 

spruce up

verb
  • To refresh, revamp; to freshen or improve something, especially its appearance. 

  • To dress or arrange smartly, elegantly, and neatly; to smarten. 

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