אֶל־כָּל־רֹ֣אשׁ דֶּ֗רֶךְ בָּנִית֙ רָֽמָתֵ֔ךְ וַתְּתַֽעֲבִי֙ אֶת־יָפְיֵ֔ךְ וַתְּפַשְּׂקִ֥י אֶת־רַגְלַ֖יִךְ לְכָל־עוֹבֵ֑ר וַתַּרְבִּ֖י אֶת־תזנתך [תַּזְנוּתָֽיִךְ׃]
Sa bawat sangandaan ay itinayo mo ang iyong mataas na dako, at ginawa mong karumal-dumal ang iyong kagandahan, at ibinuka mo ang iyong mga binti sa bawat dumaraan, at pinarami mo ang iyong mga pagpapatutot.
Rashi
you spread your legs Since He compares her to a harlot, He speaks in terms of sexual activity, in which there is spreading of the legs, a cesmas in Old French, you spread wide apart.