איכה ב:טו פירוש: רש״י

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.

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)