砂袋
す
な
ぶ
く
ろ
Meanings
1
A bag filled with sand, used for flood control, ballast, or exercise.
We stacked sandbags in preparation for the flood.
2
Only when written 砂嚢
Rare term for a bird's gizzard. The usual word is 砂嚢 read さのう. This reading すなぶくろ is uncommon and may be encountered in older or specialized texts.
See also: 砂嚢 (さのう)
A bird's gizzard (sunabukuro) is an organ that grinds food.