盛 means “heap up, prosper”

もる · moru

Also: boom, copulate

Kun'yomi (Japanese reading)
もる, さかる, さかん
On'yomi (Chinese reading)
セイ, ジョウ

JLPT N1 · Taught in grade 6 · 11 strokes

The story

A dish (皿) under 成, complete: a plate piled to the very top. 盛る is to heap food: ask for 大盛り at a ramen shop for a big serving, a party 盛り上がる when it gets lively, and a busy shop is 繁盛, booming.

Used in 大盛り (oomori, large serving), 盛ん (sakan, thriving/popular), and 繁盛 (hanjou, prosperity)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.