prep. down
adv. within, down within

Qethsegol vahrukiv Hrodmir fin Krent, wo sov pah ok eruvos ahrk faraan wah Nos tum krivaan do ok zeymah.
This stone commemorates Hrodmir the Broken, who spent all his years and fortune to Strike down the killer of his brother.
(Word Wall for Nos, Cyclone)

Lok bo, Thu’um tuum [sic]
[Lit. ‘Sky fly Voice down’, liberally ‘Sky above, Voice within’]
(High Hrothgar Banners)

Possibly derived from thu’um denoting something that lies within. May also relate to unattested word lum in lumnaar ‘valley’ meaning ‘low’.