feather one's nest vs kick in

feather one's nest

verb
  • To achieve benefits, especially financial ones, by taking advantage of the opportunities with which one is presented; to amass a comfortable amount of personal wealth. 

kick in

verb
  • To contribute, especially to a collection of money. 

  • To kick or strike (a person); to beat up 

  • To kick or strike so as to cause the object struck to collapse or fall inwards. 

  • To start, connect, or take effect, especially in a sudden way. 

How often have the words feather one's nest and kick in occurred in a corpus of books? (source: Google Ngram Viewer )