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चापवन्नाम्यमानस्य पृष्ठतो नीयते शिरः | उर उत्क्षिप्यते मन्या स्तब्धा ग्रीवाऽवमृद्यते ||४७||

the head gets retracted almost touching his back and his chest is thrown forward, the sides of the neck become rigid and the neck in total get compressed

english translation

cApavannAmyamAnasya pRSThato nIyate ziraH | ura utkSipyate manyA stabdhA grIvA'vamRdyate ||47||

hk transliteration by Sanscript