hang tough vs stomach

hang tough

verb
  • To remain strong-willed or brave, especially when experiencing duress or adversity. 

stomach

verb
  • To tolerate (something), emotionally, physically, or mentally; to stand or handle something. 

noun
  • Desire, appetite (for something abstract). 

  • The part of a garment that covers a person's stomach. 

  • An organ in animals that stores food in the process of digestion. 

  • The belly. 

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