The nations is a metonym for the people of those nations. Alternate translation: "the people of all the nations" (See: [[rc://en/ta/man/jit/figs-metonymy]])
This is a symbol for participating in her sexually immoral passion. Alternate translation: "have become sexually immoral like her" or "have become drunk like her in sexual sin" (See: [[rc://en/ta/man/jit/writing-symlanguage]])
Babylon is spoken of as if it were a prostitute who has caused other people to sin along with her. This may well have a double meaning: literal sexual immorality and also the worship of false gods. (See: [[rc://en/ta/man/jit/figs-personification]] and [[rc://en/ta/man/jit/figs-metaphor]])