This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
滏 combines the water radical 氵 with 釜 (kettle/pot). The exact historical development is uncertain, but it likely relates to water and a vessel.
Water 氵 beside a pot 釜 suggests something about liquid in a container, but the exact meaning is unclear.
For フ, imagine a pot of water boiling over with a loud 'foo' sound: foo -> フ.
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