וַיִּ֖רֶף מִמֶּ֑נּוּ אָ֚ז אָֽמְרָ֔ה חֲתַ֥ן דָּמִ֖ים לַמּוּלֹֽת׃ (פ)
So He let him alone. Then she said: ‘A bridegroom of blood in regard of the circumcision.’
Rashi on Exodus
וירף SO HE LOOSENED HIS HOLD — the angel loosened his hold ממנו FROM HIM; (cf. Exodus Rabbah 5:8). אז THEN she understood that he had come to kill him because of the delay in the circumcision,
Rashbam on Exodus
וירף המלאך ממנו, the word is similar to Judges 19,9 רפה היום לערוב, “the day has waned toward evening.” The construction of וירף from the root רפה is similar to ויקן from the root קנה, “he acquired.” The word וירף therefore means that the angel’s lethal power had become much weaker.
Sforno on Exodus
וירף ממנו, he released him partially, but not totally, as until the second part of the circumcision, the פריעה, the uncovering of the corona, had been performed the ritual is considered incomplete, and not valid.