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