Natyashastra
मुखनेत्रविकूणनया नासाप्रच्छादनावनमितास्यैः । अव्यक्तपादपतनैर्बीभत्सः सम्यगभिनेयः ॥ २॥
This is to be represented on the stage by narrowing down the mouth and the eyes, covering the nose, bending down the head and walking imperceptibly.
english translation
mukhanetravikUNanayA nAsApracchAdanAvanamitAsyaiH । avyaktapAdapatanairbIbhatsaH samyagabhineyaH ॥ 2॥
hk transliteration by Sanscript