feather one's nest

/F EH1 DH ER0 W AH0 N EH0 S N EH0 S T/
verb
  1. 1

    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.

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Source: https://en.wiktionary.org/wiki/feather%20one's%20nest