#The firstborn

"Lot's first daughter" or "The older daughter"

#the younger

"the younger daughter." AT: "her younger sister"

#according to the way of all the world

Here "the world" stands for the people. AT: "as people everywhere do" (See: [[:en:ta:vol2:translate:figs_metonymy]])

#drink wine

It can be made explicit that their goal was to get him drunk. AT: "drink wine until he gets drunk" (UDB) or "get drunk with wine" (See: [[:en:ta:vol1:translate:figs_explicit]])

#so that we may extend our father's line

This speaks about giving Lot descendants as if his family were a line that they are making longer. AT: "so that we can bear children who will be our father's descendants" (UDB) (See: [[:en:ta:vol1:translate:figs_metaphor]])

#he did not know when she lay down, nor when she arose

"he did not know anything about it" or "he did not know that she had slept with him"