scare the pants off vs tremble

scare the pants off

verb

  • To scare or startle someone thoroughly. 

tremble

verb

  • To fear; to be afraid. 

  • To shake, quiver, or vibrate. 

noun

  • A shake, quiver, or vibration. 

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