RichThesaurus
bite off more than one can chew
vs
overtax oneself
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.
overtax oneself
How often have the words
bite off more than one can chew
and
overtax oneself
occurred in a corpus of books?
(source:
Google Ngram Viewer
)