overwhelm vs touch bottom

overwhelm

noun
  • The state or condition of being overwhelmed. 

verb
  • To overpower emotionally. 

  • To cause to surround, to cover. 

  • To engulf, surge over and submerge. 

  • To overpower, crush. 

touch bottom

verb
  • To reach the lowest point. 

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