This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 涹 is uncertain. It visually combines 氵 (water) with 委, but the original semantic and phonetic roles are unclear.
With 氵 (water) beside 委, imagine murky water that obscures what lies beneath, hinting at the kun-reading にご.る (to become muddy).
For ワ, picture a wavering reflection in muddy water: wa -> ワ, as the water becomes clouded.