כֹּֽה־אָמַ֞ר אֲדֹנָ֣י יְהוִ֗ה הַכֵּ֨ה בְכַפְּךָ֜ וּרְקַ֤ע בְּרַגְלְךָ֙ וֶֽאֱמָר־אָ֔ח אֶ֛ל כָּל־תּוֹעֲב֥וֹת רָע֖וֹת בֵּ֣ית יִשְׂרָאֵ֑ל אֲשֶׁ֗ר בַּחֶ֛רֶב בָּרָעָ֥ב וּבַדֶּ֖בֶר יִפֹּֽלוּ׃
Ganito ang sabi ng Panginoong Walang-Hanggan: Pumalakpak ka ng iyong kamay at magpadyak ka ng iyong paa, at sabihin mo: “Sa aba!” dahil sa lahat ng masasamang karumal-dumal na gawain ng sambahayan ng Israel, sapagkat sila ay babagsak sa tabak, sa taggutom, at sa salot.
Rashi
and stamp Its context implies that it means to stamp one’s foot on the ground to flatten out the mud, and this is a custom of a mourner.