descendent
伷 centers on the idea of a descendant, someone who comes after in a family line.
伷 combines 亻 (person) with 由, which likely contributes the sound. The exact historical development is uncertain.
A person 亻 connected to a lineage 由: imagine a family tree where each person is a link, and 伷 is the descendant who continues the line.
For チュウ, picture a descendant chewing on a family heirloom: chew -> チュウ, and the person 亻 passes down the tradition.