סָֽפְק֨וּ עָלַ֤יִךְ כַּפַּ֙יִם֙ כָּל־עֹ֣בְרֵי דֶ֔רֶךְ שָֽׁרְקוּ֙ וַיָּנִ֣עוּ רֹאשָׁ֔ם עַל־בַּ֖ת יְרוּשָׁלִָ֑ם הֲזֹ֣את הָעִ֗יר שֶׁיֹּֽאמְרוּ֙ כְּלִ֣ילַת יֹ֔פִי מָשׂ֖וֹשׂ לְכָל־הָאָֽרֶץ׃ (ס)
Tous les passants battent des mains à ton sujet; ils ricanent, hochent la tête sur la fille de Jérusalem: "Est-ce là disent-ils la ville qu’on appelait un centre de beauté, les délices de toute la terre?"
Tze'enah Ure'enah
“Clapped” [2:15]. The people who passed by the city clapped their hands before the city and hissed with their mouths and they shook their heads that they saw the city of Jerusalem destroyed. They said: is this the city of Jerusalem that was the beautiful crown and the joy of the whole land?
Rashi
They hiss. To blow with the mouth, [i.e., to whistle], sibler in O.F. It is customary for a person to do so upon seeing an important thing that was ruined and destroyed.
Rashi
The perfection of beauty. All beauty was hers.38See Tehilim 50:2. The gematriya [numerical value] of ירושלים is equal to כלילת יופי . (Yalkut Me’am Lo’ez)