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