This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
澓 combines 氵 (water) with 復, which likely contributes the sound. The exact historical meaning is uncertain, but it may relate to water flowing back or returning.
Water 氵 flowing back 復 suggests a swirling or returning current, but the meaning is unclear.
For フク, imagine a fuku (服, clothes) being washed in swirling water: fuku -> フク, and the water returns the clothes clean.
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