gather, come together
攅 centers on bringing things together into one place: gathering people or objects, or coming together as a group.
攅 is a variant form of 攢, combining 扌 (hand) with 賛, which likely contributes the sound and the idea of gathering or assembling.
The hand 扌 beside 賛 suggests using hands to gather things together, like collecting items into a pile.
For サン, imagine gathering under the sun: sun -> サン, and everyone comes together in the sunlight.