滅 means “perish, destroy”

ほろびる · horobiru

Also: ruin, overthrow

Kun'yomi (Japanese reading)
ほろびる, ほろぶ, ほろぼす
On'yomi (Chinese reading)
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JLPT N1 · Taught in secondary school · 13 strokes

The story

Water (氵) poured on a fire (火) caught inside a halberd (戈): flames put out for good. 滅びる is to perish, 絶滅 is extinction, 点滅 is a light blinking on and off, and 滅多に means hardly ever.

Used in 滅びる (horobiru, to perish), 絶滅 (zetsumetsu, extinction), and 滅多に (mettani, rarely)

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