補ほ助じょ椅い子す

noun

booster seat; auxiliary seat; baby seat

A seat used to boost a child's height, often in cars or at tables. Can also refer to an extra or auxiliary seat in general.

• 子こ供どもが小ちいさいので、車くるまに補ほ助じょ椅い子すを付つけています。

  Since my child is small, I have a booster seat installed in the car.

• レストランで補ほ助じょ椅い子すを借かりました。

  I borrowed a booster seat at the restaurant.