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