noun
tortoise-shaped scrubbing brush
A traditional Japanese scrubbing brush with a rounded, tortoise-shell-like shape. The name comes from the product brand 'Kamenoko Tawashi', but it is often used generically for similar brushes.
台所で亀の子たわしを使って鍋を洗った。
I scrubbed the pot in the kitchen using a tortoise-shaped scrubbing brush.
祖母は昔から亀の子たわしを愛用している。
My grandmother has been using a Kamenoko Tawashi for years.
From the product name 'Kamenoko Tawashi' (亀の子束子), literally 'turtle child scrubbing brush', referring to its shape. The brand was established in the early 20th century and the name became a genericized trademark for this style of brush.