caustic soda vs souse

caustic soda

noun
  • sodium hydroxide (NaOH), a strong alkaline substance used in the manufacture of paint, soap and detergents, or as a drain cleaner. 

souse

noun
  • A pickle made with salt. 

  • Pickled scrapple. 

  • The act of sousing; a plunging into water. 

  • Pickled or boiled ears and feet of a pig 

  • The ear; especially, a hog's ear. 

  • A heavy blow. 

  • The act of sousing, or swooping. 

  • The pickled ears, feet, etc., of swine. 

  • A person suffering from alcoholism. 

verb
  • To fall heavily. 

  • To strike, beat. 

  • To steep in brine; to pickle. 

  • To immerse in liquid; to steep or drench. 

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