Can someone explain the end of the fourth stanza (bold below) of the song Azamer B'shvochim? יְחַבֵּק לַהּ בַּעְלַהּ וּבִיסוֹדָא דִי לַהּ דְּעָבֵד נְיָחָא לַהּ יְהֵא כָתֵשׁ כְּתִישִׁין
Her husband embraces her; through this gathering which brings her joy, will be utterly crushed.
Who will be utterly crushed? Why?