Charak Samhita
हनुग्रहं च संस्तभ्य हनुं(नू)संवृतवक्रताम् । मुहुराक्षिपति क्रुद्धो गात्राण्याक्षेपकोऽनिलः ॥५०॥
or by causing spasticity of the jaw, the mouth becomes fixed and cannot be opened. This is called as hanugraha (lock jaw) ॥ Aakshepaka (episodic contractions)॥ In akshepaka ( ), the provoked vata contracts vessels, tendons and ligaments of the hands
english translation
hanugrahaM ca saMstabhya hanuM(nU)saMvRtavakratAm । muhurAkSipati kruddho gAtrANyAkSepako'nilaH ॥50॥
hk transliteration by Sanscript