Where does “subtitr” come from?

subtitr (Azerbaijani) comes from Russian субтитр, from French sous-titré, from French sous-, from Old French sus-, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “subtitr”, step by step

Step	Language	Word	Meaning
1	Russian	субтитр	subtitle
2	French	sous-titré	past participle of sous-titrer; subtitled
3	French	sous-	sub-; under-
4	Old French	sus-	—
5	Latin	sub	under, beneath; behind; at the feet of
6	Proto-Italic	supo	under
7	Proto-Indo-European	upó	under, below
8	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →