衰 means “decline, weaken, wane”

おとろえる · otoroeru

Kun'yomi (Japanese reading)
おとろえる
On'yomi (Chinese reading)
スイ

JLPT N1 · Taught in secondary school · 10 strokes

The story

The Shuowen says 衰 once meant a straw raincoat: a robe (衣) with a ragged patch in the middle. Picture it fraying with age. 衰える is to weaken or decline, 衰退 is decline, and 老衰 is the frailty of old age.

Used in 衰える (otoroeru, to weaken/decline), 衰退 (suitai, decline), and 老衰 (rousui, old age/natural death)

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