Where does “ελκύω” come from?

ελκύω (Ancient Greek) comes from Ancient Greek ἑλκύω, from Ancient Greek ἕλκω, from Proto-Indo-European selk- — to pull, drag; to drag, to furrow; to pull, draw.

Ancestry of “ελκύω”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἑλκύω	Synonym of ἕλκω
2	Ancient Greek	ἕλκω	to drag
3	Proto-Indo-European	selk-	to pull, drag; to drag, to furrow; to pull, draw

Every word from Proto-Indo-European selk- →Every word from Ancient Greek ἕλκω →Every word from Ancient Greek ἑλκύω →