v. to swear, form by oath; to promise
n. oath, vow, promise

Loknir Mal-Tu wahlaan qethsegol aarii vahrukt, bonaar Vakeeza, wo vaat Mir wah jun do Keizaal, ahrk dir ko sadon gravuun.
Loknir Little-Hammer erected this stone in memory of his servant, humble Vakeeza, who swore Allegiance to the kings of Skyrim, and died in the gray autumn.
(Word Wall for Mir, Animal Allegiance)

Associated with loyalty and service.

Likely shares root with vahriin ‘sworn’.

Means ‘to swear an oath’, not ‘to curse’ or  ‘to swear by’. Does not mean ‘promising’ as in ‘favorable’.