וַיֹּ֖אמֶר מִי־אָ֑תּ וַתֹּ֗אמֶר אָנֹכִי֙ ר֣וּת אֲמָתֶ֔ךָ וּפָרַשְׂתָּ֤ כְנָפֶ֙ךָ֙ עַל־אֲמָ֣תְךָ֔ כִּ֥י גֹאֵ֖ל אָֽתָּה׃
И сказал он: 'Кто ты?' И она ответила: 'Я Руфь, твоя служанка; Поэтому расстели юбку твою на служанку твою; ибо ты близкий родственник.'
Rashi
Spread your mantle. The corner of your garment to cover me with your cloak; and this is an expression of marriage.9An expression taken from birds who spread their wings [כנף] when they mate. (Malbim)
Ibn Ezra
"ופרשת (and you shall spread):" A hint to take her as a wife.
Rashi
For you are a near kinsman. To redeem my husband’s inheritance, as it is stated, “and a close relative comes and redeems, etc.”10Vayikra 25:25. And my mother-in-law and I must sell our inheritance, and now it is incumbent upon you to buy it. Acquire [i.e., marry] me also, along with it,11The Torah requires only that he redeem the relative’s property, but it does not require that he redeem his relative’s wife. She therefore asked him to marry her. so that the name of the deceased be remembered upon his estate, so that when I come to the field they will say, “this is Machlon’s wife.”