This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
摓 combines 扌 (hand) with 逢, which likely contributes the sound. The exact historical development and original meaning are uncertain.
The hand radical 扌 beside 逢 suggests an action involving meeting or encountering, but the specific meaning is unclear.
For ホウ, imagine a hand reaching out to meet someone, and the meeting is announced with a loud 'hou!' sound: hou -> ホウ.