RobH_en_tn/jer/50/32.md

the proud ones will stumble and fall

Here "stumble and fall" are idioms that refer to defeat and death. Alternate translation: "I will cause enemies to defeat and kill the proud ones" (See: rc://en/ta/man/translate/figs-idiom)

it will devour everything around him

Fire burning the cities of Babylon is spoken of as if the fire were an animal that ate them. (See: rc://en/ta/man/translate/figs-metaphor)

around him

Here "him" refers to the "proud one" which describes Babylon.