leave alone vs tremble

leave alone

verb

  • To desist or refrain from involvement with. 

  • To stop bothering (a person). 

tremble

verb

  • To fear; to be afraid. 

  • To shake, quiver, or vibrate. 

noun

  • A shake, quiver, or vibration. 

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