אֶל־כָּל־רֹ֣אשׁ דֶּ֗רֶךְ בָּנִית֙ רָֽמָתֵ֔ךְ וַתְּתַֽעֲבִי֙ אֶת־יָפְיֵ֔ךְ וַתְּפַשְּׂקִ֥י אֶת־רַגְלַ֖יִךְ לְכָל־עוֹבֵ֑ר וַתַּרְבִּ֖י אֶת־תזנתך [תַּזְנוּתָֽיִךְ׃]
En toda cabeza de camino edificaste tu altar, y tornaste abominable tu hermosura, y abriste tus piernas á cuantos pasaban, y multiplicaste tus fornicaciones.
Rashi on Ezekiel
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.