work (one's) guts out

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work (one's) guts out

To put a great amount of effort into something; to work very hard at something. I worked my guts out for a few years as a court messenger for a legal firm while I finished up my law degree, but they eventually offered me a job as an attorney. There's nothing more disheartening than to work your guts out on an assignment, only for the computer to crash and delete all your work.
See also: gut, out, work

work your guts out

or

flog your guts out

or

slog your guts out

INFORMAL
If you work your guts out, flog your guts out or slog your guts out, you work very hard. These women were amazing. They worked their guts out from 7.30 to 4.30 every day, often all evening and weekend too if they had families. I've been slogging my guts out for months, trying to get this project finished.
See also: gut, out, work