Intestine : adj. (the'intestine is a viscerus abdominal, part of the digestive tract that follows the stomach).
“Internal” quarrels: Dissension, conflicts that occur within a group.
The adjective intestine comes from Latin intestinal which means "inside" or entrails.
This is why this adjective has long meant "which happens inside something". One only has to remember Cicero, he who already evoked the Bellum intestine or the “civil war” which we know takes place within a country and its population. Our expression, which dates from the end of the XNUMXth century, evokes the dissensions within a social group, whether you are a company, an association or a political party...
And it is true that political parties are places where the thirst for power of each other, while there is not room for everyone at the top, makes that internal quarrels are commonplace there .