تعریف و معنای "[hate] {one's} guts"

What is the origin of the idiom "hate someone's guts" and when to use it?

The origin of the idiom "hate someone's guts" is not definitively documented, but it likely stems from the idea that a person's intestines, specifically the guts, are associated with strong emotions and feelings. It often arises in heated personal conflicts, arguments, or discussions where individuals want to emphasize the intensity of their negative feelings.