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slog guts out

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slog/sweat/work your guts out

  (informal)

to work very hard or to use a lot of effort to do something You've got this wonderful man slogging his guts out for you, and all you do is criticize him! After working his guts out at the gym, he spoilt it all by going straight to the pub.

See hate guts, spill guts

See also: gut, out, slog