Where does “jura” come from?

jura (Kabuverdianu) comes from Portuguese jurar, from Old Portuguese jurar, from Latin jūrāre, from Proto-Indo-European h₂yew-, from Proto-Indo-European h₂óyu, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

jura (Kabuverdianu): swear, promise

Definitions

swear, promise

Ancestry of “jura”, step by step

Step	Language	Word	Meaning
1	Portuguese	jurar	to swear
2	Old Portuguese	jurar	—
3	Latin	jūrāre	—
4	Proto-Indo-European	h₂yew-	straight, upright, right; right, justice, law
5	Proto-Indo-European	h₂óyu	long time, lifetime
6	Proto-Indo-European	h₂ey-	vital force, life, age, eternity; day, morning

Every word from Proto-Indo-European h₂ey- →Every word from Proto-Indo-European h₂óyu →Every word from Proto-Indo-European h₂yew- →