broom (made of grass or straw)
Specifically a broom made from grass, straw, or similar plant material, as opposed to a modern plastic or synthetic broom.
祖母は庭で草箒を使って落ち葉を掃いていた。
My grandmother was sweeping fallen leaves in the garden with a grass broom.
Compound of 草 (くさ, 'grass') and 箒 (ほうき, 'broom'), literally 'grass broom'.