Genesis 43:20

בי אדני O, MY LORD — The word בי is an expression of entreaty (בעיא) and supplication. In Aramaic we have בייא בייא “woe, woe!” (Yoma 69b). ירד ירדנו WE CAME INDEED DOWN — This is a “come down” (degradation) for us. We have been accustomed to give food to others and now we are dependent upon you (Genesis Rabbah 92:4).

וַיֹּאמְר֖וּ בִּ֣י אֲדֹנִ֑י יָרֹ֥ד יָרַ֛דְנוּ בַּתְּחִלָּ֖ה לִשְׁבׇּר־אֹֽכֶל׃

and said, O sir, we came down indeed at the first time to buy food: