en_tn/lev/18/11.md

Do not uncover the nakedness of

To uncover someone's nakedness is an idiom that means to have sexual relations with them. See how you translated this idiom in Leviticus 18:6. (See: rc://en/ta/man/jit/figs-idiom)

your father's wife's daughter

Possible meanings are 1) "your half-sister" or 2) "your stepsister." Here the man does not have the same father or mother as the woman. They became brother and sister when their parents married.