or entrails, esp of an animal
The entire carcass - hide, guts, and bones - was devoured.
By the time they finish, the crewmen are standing ankle-deep in fish guts.
It takes guts to stand up to her.
The new Chancellor has the guts to push through unpopular tax increases.
It takes more guts than I've usually got to go and see him.
the guts of the problem
She has a reputation for getting at the guts of a subject and never pulling her punches.
The guts of the reactor have to be hauled out of the pressure vessel.
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