This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 暜 is uncertain. It visually combines 竝 (standing side by side) and 日 (sun), but the original meaning and component function are unclear.
Two figures standing side by side under the sun, but the intended meaning is unclear.
For フ, imagine the two figures standing under the sun, making a 'foo' sound as they exhale together: foo -> フ.