त्रास् - त्रासदय - Tragedy

Tras (त्रस्).—I. 1, 4 P. (trasati, trasyati, trasta) 1) To quake, tremble, shake, start with fear. 2) To fear, dread, be afraid of (with abl., sometimes with gen. or instr.); यस्य त्रसन्ति शवसः (yasya trasanti śavasaḥ) Rv.6.14.4; प्रमदवनात्त्रस्यति (pramadavanāttrasyati) K.255; कपेर- त्रासिषुर्नादात् (kapera- trāsiṣurnādāt) Bk.9.11;5.75;14.48;15.58; Śi.8.24; Ki.8.7. 3) To run away, run from. -Caus. (trāsayati-te) To frighten, terrify. -II. 1 U. (trāsayati-te) 1) To go, move. 2) To hold. 3) To take, seize. 4) To oppose, prevent त्रासदय - त्रस् + अ (to make noun) + द (giving) + य (adjective, of nature of noun).

Alternation - अन्नतायन

Etymology (इति मल लोग(लोक)) of Alternation अन्नतायन - following a different path or option अन् - Prefix of not, "un" comes from here. नत​ - Following, Bowing, Giving in, Obesisience आयन - Following like the suffix in Ram-ayana.