slog/ sweat/ work one’s guts out

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People like me, who've worked their guts out to expand the business while the militant bastards have been working their guts out to destroy it.

So someone would come and clean his car and he'd give it to them, yet you would work your guts out for a fairly modest salary.

Trainer Michael O'Leary was also hopping mad. He said: I worked my guts out to get King Taros right to win the race and look what happened. It's a disgrace.

(BNC-B)

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