knock, pick out, ridicule
搉 centers on a forceful, striking action: knocking, or the act of picking out by striking or tapping. The ridicule sense likely extends from the idea of striking with words or mockery.
搉 combines 扌 (hand) with 隺, which likely contributes the sound and may relate to striking or knocking. The exact historical development of the right component is uncertain.
The hand radical 扌 beside 隺 suggests a hand striking something. Imagine knocking on a door or picking out a specific object by tapping it.
For カク, picture a hand knocking on a hard surface with a sharp 'kaku' sound: kaku -> カク, and the knock echoes.