sharing the same concern; mutual worry
Used when people share a common worry or anxiety. Often appears in formal or written contexts, and in the set phrase 同憂の士 (people who share the same concern).
They gathered as people sharing the same concern.
I share the same concern about this issue.
Compound of 同 (same) and 憂 (worry, anxiety). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese pattern for expressing shared states.