ה֤וֹלֵ֥ךְ אַחֲרֶ֗יהָ פִּ֫תְאֹ֥ם כְּ֭שׁוֹר אֶל־טָ֣בַח יָב֑וֹא וּ֝כְעֶ֗כֶס אֶל־מוּסַ֥ר אֱוִֽיל׃
Ele a segue logo, como boi que vai ao matadouro, e como o louco ao castigo das prisões;
Rashi
and with their feet they spout venom When they would pass in the street near Jewish youths, they would stamp their feet and hint to them of the affection of the adulteresses, in order to arouse their temptation, like the venom of a serpent. עֶכֶס is the venom of a serpent.