swinging vs tremble

swinging

noun
  • The act or motion of that which swings. 

  • An activity where couples engage in sexual activity with different partners. 

adj
  • Sexually promiscuous. 

  • Fine, good, successful. 

tremble

noun
  • A shake, quiver, or vibration. 

verb
  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

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