副
とりわけ · toriwake · JLPT N1 · noun
especially
副 — 刀 knife + 畐 (full vessel, phonetic)
A semantic-phonetic compound. The knife radical 刂 (刀) suggests cutting or splitting, while 畐 (a full jar) gives the sound. The original sense was 'to split in two,' which extended to 'secondary' or 'deputy' — something paired alongside the main one.