RichThesaurus
feather one's own nest
vs
look out for number one
feather one's own nest
look out for number one
verb
To act in one's own interests; to act in a manner advantageous primarily to oneself.
How often have the words
feather one's own nest
and
look out for number one
occurred in a corpus of books?
(source:
Google Ngram Viewer
)