companion, similar kind
儔 centers on a person who is of the same kind or group: a companion, peer, or someone of a similar sort.
儔 combines 亻 (person) with 壽, which likely contributes the sound and the idea of long-standing association, suggesting a companion of long acquaintance.
A person 亻 beside 壽 (long life) suggests a companion who has been with you for a long time, someone of a similar kind.
For チュウ, imagine choosing a companion: choose -> チュウ, and the person 亻 beside you is the one you picked.
equal; match