Natyashastra
गतिं तत्र प्रयुञ्जीत बीभत्साभिनयं प्रति । क्वचिदासन्नपतितैः विकृष्टपतितैः क्वचित् ॥ ५५॥
In that (sentiment), the gait should be employed with repulsive acting, sometimes with near stumbling, sometimes with awkward falling.
english translation
gatiM tatra prayuJjIta bIbhatsAbhinayaM prati । kvacidAsannapatitaiH vikRSTapatitaiH kvacit ॥ 55॥
hk transliteration by Sanscript