collapse vs promotion

collapse

noun
  • The act of collapsing. 

  • Constant function, one-valued function (in automata theory) (in particular application causing a reset). 

verb
  • To cease to function due to a sudden breakdown; to fail suddenly and completely. 

  • To break apart and fall down suddenly; to cave in. 

  • To fold compactly. 

  • To hide additional directory (folder) levels below the selected directory (folder) levels. When a folder contains no additional folders, a minus sign (-) appears next to the folder. 

  • To pass out and fall to the floor or ground, as from exhaustion or other illness; to faint. 

  • For several batsmen to get out in quick succession 

  • To cause something to collapse. 

promotion

noun
  • Forward motion. (Contrast remotion.) 

  • An event intended to increase the reach or image of a product or brand. 

  • Transformation of a pawn into a piece (by reaching the opponent's back rank). 

  • Dissemination of information in order to increase its popularity. 

  • An advancement in rank or position. 

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