没 means “sink, vanish, die”

ぼつ · botsu

Also: drown, hide, fall into

Kun'yomi (Japanese reading)
おぼれる, しずむ, ない
On'yomi (Chinese reading)
ボツ, モツ

JLPT N1 · Taught in secondary school · 7 strokes

The story

Water (氵) beside a hand (又) under a curved shape (几): picture a hand going under, the last thing seen of someone sinking. 没 is going under: a ship's 沈没, the sun's 日没, and 没頭, sinking yourself into your work.

Used in 没頭 (bottou, absorption in), 日没 (nichibotsu, sunset), and 没収 (bosshuu, confiscation)

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