This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 夿 is uncertain. It visually combines 大 (big) and 巴, but the original purpose and component relationship are unclear.
With no clear meaning, picture a big (大) swirling shape (巴) that is mysterious and undefined.
For ハ, imagine a big (大) laugh: 'Ha!' (ハ) coming from the swirling 巴 shape.