ascend vs keel over

ascend

verb
  • To succeed. 

  • To slope in an upward direction. 

  • To become higher in pitch. 

  • To move upward, to fly, to soar. 

  • To trace, search or go backwards temporally (e.g., through records, genealogies, routes, etc.). 

  • To lose one's virginity, especially of a man through unpaid and consensual sexual intercourse with a woman. 

  • To go up. 

  • To rise; to become higher, more noble, etc. 

keel over

verb
  • To die. 

  • To collapse in a faint; to black out, to swoon. 

  • Of a vessel: to roll so far on its side that it cannot recover; to capsize or turn turtle. 

How often have the words ascend and keel over occurred in a corpus of books? (source: Google Ngram Viewer )