let in vs repel

let in

verb
  • To let someone or something come in; to admit someone or something in. 

  • To associate with. 

  • To divulge one's inner thoughts to (someone), making oneself emotionally vulnerable to them; to open up to (someone). 

repel

verb
  • To reject, put off (a request, demand etc.). 

  • To ward off (a malignant influence, attack etc.). 

  • To drive back (an assailant, advancing force etc.). 

  • To cause repulsion or dislike in; to disgust. 

  • To save (a shot). 

  • To force away by means of a repulsive force. 

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