Where does “wapas” come from?

wapas (Naga Pidgin) comes from Hindi वापस, from Persian واپس, from Persian پس, from Middle Persian 𐭯𐭮, from Old Persian 𐎱𐎿𐎠, from Proto-Indo-Iranian *pasčáH, from Proto-Indo-European pós — afterwards, post; by, at.

wapas (Naga Pidgin): back

Definitions

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Ancestry of “wapas”, step by step

Step	Language	Word	Meaning
1	Hindi	वापस	back; returned, restored
2	Persian	واپس	returned
3	Persian	پس	then; so; back part; back; hind
4	Middle Persian	𐭯𐭮	—
5	Old Persian	𐎱𐎿𐎠	—
6	Proto-Indo-Iranian	*pasčáH	—
7	Proto-Indo-European	pós	afterwards, post; by, at

Every word from Proto-Indo-European pós →Every word from Proto-Indo-Iranian *pasčáH →Every word from Old Persian 𐎱𐎿𐎠 →