פּירוש אויף יחזקאל 21:17

and wail Heb. וְהֵילֵל, a term for wailing (יְלָלָה).

for it The sword will be upon My people and upon their princes and officers.

those gathered to the sword Heb. מְגוּרֵי, a gathering of nations coming to the sword were around My people. So did Jonathan render מְגוּרֵי, related to the word in (Prov. 10: 5): “An intelligent son gathers (אוֹגֵר) in the summer”; (ibid. 6:8), “She gathers (אָגְרָה) her food in the harvest”; (Joel 1:17), “garners (מַמְּגֻרוֹת) are demolished”; (Haggai 2:19), “The seed is still in the granary (בַּמְגוּרָה).” Menachem, however, connected it to the word for fear, like (Num. 22:3): “And Moab became terrified (וַיָגָר).”

therefore, clap upon your thigh as a wailing and a lament.