Where does “pirmąsykį” come from?

pirmąsykį (Lithuanian) comes from Lithuanian pirmas, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “pirmąsykį”, step by step

StepLanguageWordMeaning
1Lithuanianpirmasfirst; primary
2Proto-Indo-Europeanper-before, in front; first; to go through
3Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Lithuanian pirmas →