feed off vs tuck in

feed off

verb
  • To consume as part of a diet. 

  • To get stimulus from (an external object). 

tuck in

verb
  • To eat heartily. 

  • To place in a small space. 

  • To push (the fabric at the bottom of a shirt) under the pants. 

  • To score from with a casual motion 

  • To pull the blankets or duvet up over (someone in bed); to put (someone) to bed. 

  • To acquire something tiny 

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