This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
稃 combines 禾 (grain) with 孚, which likely contributes the sound. The exact historical development is uncertain.
The grain radical 禾 beside 孚 suggests something related to grain or rice plants, but the exact meaning is unclear.
For フ, imagine a grain husk floating away with a soft 'fu' sound: fu -> フ, as the chaff separates from the grain.