Definiția și Sensul lui "[have] the (guts|nerve|spine)"

What is the origin of the idiom "have the guts" and when to use it?

The idiom "have the guts" originates from the idea that the "guts" (referring to the intestines or stomach) are associated with inner strength and determination. The phrase is often used in informal conversations, storytelling, or informal writing to emphasize the requirement for inner strength and determination in order to confront difficult or unconventional situations head-on.