This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The character combines 忄 (heart) with 韋, but the original semantic and phonetic roles are unclear.
With no clear meaning, picture the heart radical 忄 beside 韋 as a mysterious, unresolved feeling.
For イ, imagine an eagle (イーグル) perched on the heart, but the meaning remains a mystery: イーグル -> イ.