harm vs lay a finger on

harm

verb

  • To cause injury to another; to hurt; to cause damage to something. 

noun

  • detriment; misfortune. 

  • physical injury; hurt; damage 

  • That which causes injury, damage, or loss. 

  • emotional or figurative hurt 

lay a finger on

verb

  • To merely touch. 

How often have the words harm and lay a finger on occurred in a corpus of books? (source: Google Ngram Viewer )