This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
篵 combines 竹 (bamboo) with 從, but the exact historical origin and meaning are uncertain. It may have originally referred to a bamboo-related object or name, but no clear evidence is available.
With bamboo 竹 over 從, imagine a bamboo tool used for following or accompanying, but its true meaning is unclear.
For ソウ, picture a bamboo shoot growing straight up: the sound 'so' (like 'sow') cues ソウ, as if sowing bamboo seeds.
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