This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
搿 visually combines 手 (hand) on both sides of 合 (join, fit). The exact historical development is uncertain.
Two hands 手 on either side of 合 (join) suggest bringing hands together, perhaps to clasp or hold.
For カク, imagine two hands clapping together with a sharp 'kak' sound: kak -> カク, as the hands join.
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