en_tn_lite_do_not_use/lev/20/11.md

lies with his father's wife

This is a polite way of saying that he has sexual relations with his father's wife. Alternate translation: "has sexual relations with his father's wife" (See: rc://en/ta/man/jit/figs-euphemism)

he uncovers his father's nakedness

Here the idiom "uncovers ... nakedness" means "disgraces." See how you translated this idiom in Leviticus 18:7. Alternate translation: "he disgraces his father" or "he shames his father" (See: rc://en/ta/man/jit/figs-idiom)