back out vs retire

back out

verb
  • To withdraw from something one has agreed to do. 

  • To exit a mode or function. 

  • To draw from behind the back [+accusative = a knife etc.] (as also bare back). 

  • To undo (a change). 

  • Coordinate terms: cancel, call off, get cold feet 

  • To reverse (a vehicle) from a confined space. 

  • See also: sell short 

  • To dare (someone) to not withdraw from a challenge. 

  • To bet on someone losing. 

  • Coordinate term: scare off 

retire

verb
  • To withdraw; to take away. 

  • To stop working on a permanent basis, usually because of old age or illness. 

  • To cease use or production of something. 

  • To go back or return; to withdraw or retreat, especially from public view; to go into privacy. 

  • To fit (a vehicle) with new tires. 

  • To recede; to fall or bend back. 

  • To go to bed. 

  • To voluntarily stop batting before being dismissed so that the next batsman can bat. 

  • To retreat from action or danger; to withdraw for safety or pleasure. 

  • To withdraw from circulation, or from the market; to take up and pay. 

  • To cause to retire; specifically, to designate as no longer qualified for active service; to place on the retired list. 

  • To make a play which results in a runner or the batter being out, either by means of a put out, fly out or strikeout. 

noun
  • The act of retiring, or the state of being retired. 

  • A place to which one retires. 

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