flay vs undress

flay

verb
  • To strip the skin off; to skin. 

  • To cause to fly; put to flight; drive off (by frightening). 

  • To frighten; scare; terrify. 

  • To be fear-stricken. 

  • To lash or whip. 

noun
  • A fright; a scare. 

  • Fear; a source of fear; a formidable matter; a fearsome or repellent-looking individual. 

undress

verb
  • To strip of something. 

  • To remove the clothing of (someone). 

  • To remove one's clothing. 

  • To remove one’s clothing. 

  • To take the dressing, or covering, from. 

noun
  • Partial or informal dress for women, as worn in the home rather than in public. 

  • Informal clothing for men, as opposed to formal or ceremonial wear. 

  • Now more specifically, a state of having few or no clothes on. 

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