RobH_en_tn/deu/28/37.md

of horror, a proverb, and a byword, among all the peoples where Yahweh will lead you away

Here the words "proverb" and "byword" mean basically the same thing. This can be translated as a new sentence. Alternate translation: "of horror. The people, in the places where Yahweh will send you, will make up proverbs and bywords about you" or "of horror. Yahweh will send you to peoples who will laugh at you and ridicule you" (See: rc://en/ta/man/translate/figs-doublet)

byword

a word or phrase that people use to shame others