RichThesaurus
bite off more than one can chew
vs
defeat one's own ends
bite off more than one can chew
verb
To try to do too much; to take on or attempt more than one is capable of doing.
defeat one's own ends
How often have the words
bite off more than one can chew
and
defeat one's own ends
occurred in a corpus of books?
(source:
Google Ngram Viewer
)