Where does “síðr” come from?

síðr (Old Norse) comes from Proto-Germanic sīþuz, from Proto-Indo-European seh₁- — to impress, insert; to sow, to plant; long,...

Ancestry of “síðr”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	sīþuz	late
2	Proto-Indo-European	seh₁-	to impress, insert; to sow, to plant; long,...