keel over vs tumble

keel over

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

  • To die. 

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

tumble

verb
  • To drop rapidly. 

  • To smoothe and polish, e.g., gemstones or pebbles, by means of a rotating tumbler. 

  • To muss, to make disorderly; to tousle or rumple. 

  • To obscure the audit trail of funds by means of a tumbler. 

  • To perform gymnastics such as somersaults, rolls, and handsprings. 

  • To fall end over end; to roll over and over. 

  • To have sexual intercourse. 

  • To move or rush in a headlong or uncontrolled way. 

noun
  • A fall, especially end over end. 

  • An act of sexual intercourse. 

  • A disorderly heap. 

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