depress vs tremble

depress

verb
  • To make depressed, sad or bored. 

  • To cause a depression or a decrease in parts of the economy. 

  • To press down. 

  • To bring down or humble; to abase (pride, etc.). 

  • To reduce (an equation) in a lower degree. 

tremble

verb
  • To fear; to be afraid. 

  • To shake, quiver, or vibrate. 

noun
  • A shake, quiver, or vibration. 

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