蓄 means “store up, save, accumulate”

たくわえる · takuwaeru

Also: amass, raise, hoard, store

Kun'yomi (Japanese reading)
たくわえる
On'yomi (Chinese reading)
チク

JLPT N1 · Taught in secondary school · 13 strokes

The story

Grass (艹) piled over 畜, livestock: hay stacked high to see the herd through winter. 蓄える is to store up, 貯蓄 is savings, and 備蓄 is the emergency stockpile of water and food many Japanese homes keep for earthquakes.

Used in 蓄える (takuwaeru, to store up), 貯蓄 (chochiku, savings), and 蓄積 (chikuseki, accumulation)

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