crawfish vs pull in one's horns

crawfish

verb
  • To backpedal, desert or withdraw (also used with out). 

noun
  • Various marine crustaceans, rock lobster; especially Jasus lalandii, the Cape crawfish. 

  • Various freshwater crustaceans, crayfish. 

  • A slur against Anglo-Canadians used in some corners of Quebec (including the Gaspé). 

pull in one's horns

verb
  • To become less impassioned, aggressive, or argumentative; to exercise restraint; to yield or capitulate. 

How often have the words crawfish and pull in one's horns occurred in a corpus of books? (source: Google Ngram Viewer )