RichThesaurus
bust one's ass
vs
work like a horse
bust one's ass
verb
To work very hard, to put in a lot of effort.
To hurt or beat up.
work like a horse
verb
To work very hard; to toil.
How often have the words
bust one's ass
and
work like a horse
occurred in a corpus of books?
(source:
Google Ngram Viewer
)