ציטירנדיקער פּירוש אויף תהילים 80:7

And the word la'ag (לַעַג - scorn, derision): Is always [found] with the letter Lamed [as a prefix to the object being scorned], like (Psalm 22:8) "they mock me" (yal'igu li) [and (Psalm 80:7)] "therefore our enemies mock them" (ve-oyveinu yil'agu lamo). [This is] a manner of expression (derekh kinuy - perhaps meaning 'idiomatic usage' or 'reference'), as I will explain [elsewhere, or referring perhaps to the specific usage here].