Natyashastra
विच्यवात् समपादाया विच्यवां सम्प्रयोजयेत् । निकुट्टयंस्तलाग्रेण पादस्य धरणीतलम्॥ १९॥
Vicyavā—separating the feet from the Samapādā position and striking the ground with their fore part.
english translation
vicyavAt samapAdAyA vicyavAM samprayojayet । nikuTTayaMstalAgreNa pAdasya dharaNItalam॥ 19॥
hk transliteration by Sanscript