Where does “δεσμός” come from?

δεσμός (Ancient Greek) comes from Ancient Greek δέω, from Proto-Indo-European deh₁- — to bind.

δεσμός (Ancient Greek): bond, fetter; collar, halter; bondage,...

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	δέω	I bind, tie, fasten, fetter; To lack, need,...
2	Proto-Indo-European	deh₁-	to bind

δεσμός — Etymology, Origin & Word History | Etymology Explorer