coarse, rough, rude
麄 centers on a lack of refinement: something coarse, rough, or rude in texture or manner.
麄 is a variant form of 麁, which combines 鹿 (deer) with a component suggesting coarseness. The exact historical development is uncertain, but it likely relates to the rough texture of deer hair or hide.
A deer (鹿) split into parts (分) might have a rough, coarse appearance. Imagine a deer's hide being divided, revealing its rough texture.
For ソ, picture a coarse piece of fabric being sewn (ソ) together roughly. The sewing sound 'so' cues the reading ソ.