富む
とむ · tomu · JLPT N1 · verb-godan
to be rich
💰 富 = roof 宀 over 畐 (full): a house brimming with wealth, so rich
The same 畐 (full vessel) part appears in 福 fuku (good fortune) and 富裕 fuyū (affluent), so 富 always carries the idea of abundance.
富 — roof 宀 + one 一 + mouth 口 + field 田
Originally a pictograph of a tall jar full of grain or wine under a roof, symbolizing a household with abundant stores. The lower part 畐 depicted the full vessel and also gave the sound, while 宀 (roof) marked the home. Over time the meaning shifted from 'full vessel' to 'wealth, abundance, rich.'