重箱
じゅうばこ jūbako; multi-tiered food box
Why it means this
重 (stacked) + 箱 (a box) — the tiered lacquered boxes used for celebratory food, especially at New Year; 重箱の隅をつつく, to nitpick.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.