The phrase "bring down a curse" is an idiom meaning for a curse to come upon her. Alternate translation: "that can cause a curse to come upon her" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here the author speaks about the woman bearing the curse that Yahweh gives her, which causes other people to curse her. This is spoken of as if the woman herself becomes a curse. Alternate translation: "Because Yahweh curses you, other people will curse you as well, and Yahweh will show people that you are truly cursed" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. Alternate translation: "that he will show to your people as a curse" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Here the word "thigh" is a polite way of referring to the woman's womb or her private parts. Alternate translation: "your womb to be useless" (See: [[rc://en/ta/man/translate/figs-euphemism]])