This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
晼 combines 日 (sun) with 宛, which likely contributes the sound. The exact historical development is uncertain, and the character is rare.
The sun 日 beside 宛 suggests a scene of the sun setting or a particular time of day, but the exact meaning is unclear.
For エン, imagine the sun 日 ending the day: end -> エン, as the sun sinks beside the 宛 shape.
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