Where does “శత్రువు” come from?

శత్రువు (Telugu) comes from Sanskrit शत्रु, from Proto-Indo-Aryan śátruṣ, from Proto-Indo-Iranian ćátruš, from Proto-Indo-European ḱét-ru-s, from Proto-Indo-European ḱet- — to be angry.

శత్రువు (Telugu): enemy

Definitions

enemy

Ancestry of “శత్రువు”, step by step

Step	Language	Word	Meaning
1	Sanskrit	शत्रु	literally probably "overthrower"; enemy, foe;...
2	Proto-Indo-Aryan	śátruṣ	—
3	Proto-Indo-Iranian	ćátruš	—
4	Proto-Indo-European	ḱét-ru-s	—
5	Proto-Indo-European	ḱet-	to be angry

Every word from Proto-Indo-European ḱet- →Every word from Proto-Indo-European ḱét-ru-s →Every word from Proto-Indo-Iranian ćátruš →