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