וַיֹּאמְר֣וּ אֲלֵיהֶ֗ם לֹ֤א נוּכַל֙ לַעֲשׂוֹת֙ הַדָּבָ֣ר הַזֶּ֔ה לָתֵת֙ אֶת־אֲחֹתֵ֔נוּ לְאִ֖ישׁ אֲשֶׁר־ל֣וֹ עָרְלָ֑ה כִּֽי־חֶרְפָּ֥ה הִ֖וא לָֽנוּ׃
און זײ האָבן צו זײ געזאָגט: מיר קענען ניט טאָן די דאָזיקע זאַך, צו געבן אונדזער שװעסטער צו אַ מאַן װאָס איז אומבאַשניטן, װאָרום דאָס איז אַ חרפּה פֿאַר אונדז.
Rashi
חרפה הוא THAT WERE A DISGRACE — Amongst us it is somewhat of a blot on our pedigree, for if one wishes to revile another, he says to him: “You are an uncircumcised person”, or “the son of an uncircumcised person”. The word חרפה always means “reviling”.
Chizkuni
כי חרפה היא לנו, “for it is something shameful in our eyes.” Their argument was as follows: “if you do not circumcise yourselves as part of the bargain then one fine day you will declare all of us as baaley mum, cripples or deformed because we lack a foreskin.”
Sforno
כי חרפה היא לנו, it would appear that none of the circumcised men among us were fit to marry our sister.