Rut 3:9

And he said, Who art thou? And she answered, I am Ruth thine handmaid: spread therefore thy skirt over thine handmaid; for thou art a near kinsman. Spread therefore thy skirt over thine hand maid - Hebrew, Spread thy wing. The wing is the emblem of protection, and is a metaphor taken from the young of fowls, which run under the wings of their mothers, that they may be saved from birds of prey.

The meaning here is, Take me to thee for wife; and so the Targum has translated it, Let thy name be called on thy handmaid to take me for wife, because thou art the redeemer; i.e., thou art the גאל goel, the kinsman, to whom the right of redemption belongs. See on Rut 2:20 (note). Even to the present day, when a Jew marries a woman, he throws the skirt or end of his talith over her, to signify that he has taken her under his protection.