RichThesaurus
sweat one's guts out
vs
work one's fingers to the bone
sweat one's guts out
verb
to work very hard.
work one's fingers to the bone
verb
To work especially hard, usually for an extended period.
How often have the words
sweat one's guts out
and
work one's fingers to the bone
occurred in a corpus of books?
(source:
Google Ngram Viewer
)