disturb, throw into confusion
撹 centers on stirring up a settled state: disturbing order or throwing things into confusion, often through physical agitation.
撹 is the modern simplified form of 攪. The older form combines 扌 (hand) with 覺, which likely contributed the sound and the idea of awakening or stirring. The modern form replaces 覺 with the simplified 覚.
A hand 扌 beside 覚 (awakening) suggests stirring someone awake: the hand disturbs their sleep and throws them into confusion.
For カク, imagine a hand stirring a pot of thick, sticky liquid that makes a 'kaku' sound as it bubbles and churns: kaku -> カク.