noon vs plop down

noon

verb
  • To relax or sleep around midday 

noun
  • The highest point; culmination. 

  • The letter ن in the Arabic script. 

  • The time of day when the sun is in its zenith; twelve o'clock in the day, midday. 

plop down

verb
  • To sit or lie down heavily and inelegantly. 

  • To put down (something) in a heavy way. 

  • To pay. 

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