サン, ち.る, ち.らす, ち.らす, ち.らかす, ち.らかる, ばら, ちる
scatter, disperse, spend, squander
JLPT3 G4 S12 F758
The relevant seal inscription form shows 散 to be a variant of a character that is ?as described in 麻 (hemp) + an element combining 肉 flesh and 攴 action indicator → shred and *scatter* vegetable matter or flesh → *resolve*; *remove*; *pointless*. For the idea of shredding or stripping away, and for the graphical evolution of 散 as well, compare the remnant element above 食 in 餐.
[Full Kanji Etymology List]