atmosphere, fog
雰 centers on a hazy, enveloping atmospheric condition: fog or a misty atmosphere that reduces clarity.
雰 combines 雨 (rain) with 分 (divide, part), likely suggesting a misty or foggy atmosphere where things are obscured or indistinct. The exact historical development is uncertain.
Rain 雨 is divided 分 into a fine, suspended mist: fog and atmosphere.
For フン, imagine a thick fog so dense you can only see a few inches ahead: fun -> フン, and the fog makes the atmosphere eerie.
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