incline vs tumble

incline

verb
  • To tend to do or believe something, or move or be moved in a certain direction, away from a point of view, attitude, etc. 

  • To bend or move (something) out of a given plane or direction, often the horizontal or vertical. 

  • To slope. 

noun
  • A portal of a subway tunnel. 

  • A slope. 

tumble

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

  • 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 drop rapidly. 

noun
  • A fall, especially end over end. 

  • An act of sexual intercourse. 

  • A disorderly heap. 

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