וַתֹּ֣אמֶר אֶל־הָעֶ֗בֶד מִֽי־הָאִ֤ישׁ הַלָּזֶה֙ הַהֹלֵ֤ךְ בַּשָּׂדֶה֙ לִקְרָאתֵ֔נוּ וַיֹּ֥אמֶר הָעֶ֖בֶד ה֣וּא אֲדֹנִ֑י וַתִּקַּ֥ח הַצָּעִ֖יף וַתִּתְכָּֽס׃
종에게 말하되 들에서 배회하다가 우리에게로 마주 오는 자가 누구뇨 종이 가로되 이는 내 주인이니이다 리브가가 면박을 취하여 스스로 가리우더라
Rashi on Genesis
ותתכס AND [SHE] COVERED HERSELF — This has a passive meaning (she was covered); it is like (35:8) ותקבר “and she was buried”, and (1 Samuel 4:18) ותשבר “and [his neck] was broken”.
Rashbam on Genesis
?מי האיש הלזה ההולך בשדה לקראתנו, this verse raises a number of questions. Did Rivkah enquire about the identity of every man that they encountered on this journey? Furthermore, why did the Torah have to write the words בשדה לקראתנו, “in the field toward us?” It appears that the verse is somewhat abbreviated. What Rivkah wanted to know was why the man approaching them had detoured from the regular path and was coming across the field in their direction.
Sforno on Genesis
ותתכס, for she was afraid to look more closely, similar to Moses being afraid to look more closely at the burning bush in Exodus 3,6.