go in hurry, hasten, urge
趲 centers on moving quickly and with purpose: going in a hurry, hastening, or urging someone to speed up.
趲 combines 走 (run, move) with 贊, which likely contributes the sound and may reinforce the idea of urging or hastening. The exact historical development is uncertain.
The running enclosure 走 wraps around 贊, which looks like a pile of treasures (貝) being urged forward. Picture someone hastily urging a cart full of valuables to move faster.
For サン, imagine the sun (サン) beating down, making everyone hurry to get out of the heat. The sun urges you to hasten: sun -> サン.