Gnomish
sô-
verb. to wash clean, bathe
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sô-
verb. to wash clean, bathe
A verb in the Gnomish Lexicon of the 1910s appearing as G. {sûtha- >> sû- “wash clean” and sôtha- “bathe (tr. & intr.)” >>} sô- “wash clean, bathe (tr. & intr.)”, all based on the early root ᴱ√soƀ (GL/68). Likely the long ô is the result of the sound change whereby *ou* became *ō* as was usual in Gnomish of the 1910s.
Neo-Sindarin: In later Sindarin ancient *ou* became *ū* which produces problematic verb forms, so I would instead adapt this verb as ᴺS. sov- “to wash clean, bathe” as a cognate to ᴺQ. sov- “✱to bathe”. See also ᴺS. whal- “to wash”.