וַהֲבֵאתָ֖הּ אֶל־תּ֣וֹךְ בֵּיתֶ֑ךָ וְגִלְּחָה֙ אֶת־רֹאשָׁ֔הּ וְעָשְׂתָ֖ה אֶת־צִפָּרְנֶֽיהָ׃
זאָלסטו זי ברענגען אין דײַן הױז, און זי זאָל אָפּגאָלן איר קאָפּ, און אָפּשנײַדן אירע נעגל;
Rashi
take away Heb. אסף [lit., gather in,] hide our reproach, similar to (Deut. 22:2): “And you shall gather it (ואספתו) into your house.” For the woman, when she is married, will not be dealt with licentiously. According to Midrash Aggadah, (Lamentations Rabbah 5:11) Nebuchadnezzar commanded (or decreed upon) [his armies] not to have relations with married women, lest they be punished. They, therefore, begged to be nominally married.
Rashi
ויעש אלהים את הרקיע AND GOD MADE THE EXPANSE — He put it in proper condition in its place: this is the meaning of “making” it. Similarly (Deuteronomy 21:12) ועשתה את צפרניה “And she shall let grow (literally, make) her nails”.
Siftei Chakhamim
Similar to, “And she made [fixed]...” I.e., ועשתה also means fixing [i.e., improving]. You might object: There (Devarim 21:12), Rashi explained that ועשתה means that she lets her nails grow in order to make herself repulsive. Thus it means [the opposite], not fixing up! The answer is: letting the nails grow indeed improves them, although it makes the woman appear repulsive. Hence, Rashi’s proof from ועשתה is valid. (Re’m) Another answer: By letting her nails grow, although it makes her repulsive, it will eventually improve her status — for otherwise she is prohibited to marry. (Maharshal) The term עשייה clearly means fixing, according to all views, as the Gemara (Yevamos 48a) proves from מפיבושת, about whom it says, ולא עשה רגליו ולא עשה שפמו (Shmuel II, 19:25). Although in that Gemara, Rabbi Akiva and Rabbi Eliezer disagree whether ועשתה means letting her nails grow or trimming them, the reasons for their views are explained there. (Nachalas Yaakov, see further elaboration there)