This compares the prophets of Israel to lions who attack and kill their victims. Alternate translation: "They kill people for they are like roaring lions who attack and kill their prey. They take peoples' precious wealth" (See: [[rc://en/ta/man/translate/figs-simile]])
The word "her" refers to Israel. They "make many widows" by killing married men. Alternate translation: "they make many women into widows by killing their husbands" (See: [[rc://en/ta/man/translate/figs-explicit]])