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