This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
淴 combines 氵 (water) with 忽, but the exact historical development and original meaning are uncertain.
Water 氵 beside 忽 (which contains 勿 and 心) suggests a sudden splash or a fleeting thought, but the meaning is unclear.
For オツ, imagine a sudden splash of water making an 'ots' sound: ots -> オツ, like a stone dropping into a pond.
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