From Proto-Indo-European *ḱak- (“branch, stick”) (whence also sakne (q.v.)) from Proto-Indo-European *kek- / *ḱek- / *kekʰ- / *ḱekʰ-. Cognate with Lithuanian šaka (“branch”). Semantic development: branch > parting place of two branches > the two beams around a horse's neck. Along with šak- > sak-, there is cak-/čak-, cf. čaka (“a stick with an offshoot to use as its handle”) whence čakarēt. See Russian соха (soxa) for additional cognates.
sakas f (4th declension)
- collar (for a horse)