Here "the nations" refer to the people who live in them. Alternate translation: "In your fury, punish the nations" or "In your anger, punish the nations of the people" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])
These three phrases have the same meaning. Jeremiah repeats this idea three times to emphasize the utter destruction of Israel. This speaks of the enemy armies attacking the people of Israel as if the armies were a fierce animal attacking and devouring its prey. Alternate translation: "For they have fiercely attacked the people of Israel and consumed them so as to completely destroy them" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metaphor]])