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