Rashi on Genesis 38:14/רש"י על בראשית ל״ח:י״ד

1ותתעלף AND SHE WRAPPED HERSELF — she veiled her face that he should not recognise her.

2ותשב בפתח עינים AND SHE SAT AT THE ENTRANCE OF ENAYIM (literally, at the opening of the eyes) — at the place where the eyes become opened:) at the cross-road which is on the way leading to Timnah. Our Rabbis explain (Sotah 10b) that it means at the door (פתח) of our father Abraham’s residence to which all eyes עינים)) looked forward to pay a visit.

3כי ראתה כי גדל שלה FOR SHE SAW THAT SHELAH WAS GROWN etc. — This was the reason why she offered herself to Judah, for she was anxious to have children from him (as an ancestor in some way or other) (Horayot 10b).