代だい替たい品ひん

noun

substitute; replacement; backup

A product or item used in place of another, often when the original is unavailable or as a spare.

• 純じゅん正せい部ぶ品ひんがないので、代だい替たい品ひんを使つかうしかなかった。

  Since there were no genuine parts, we had no choice but to use a substitute.

• 災さい害がい時じに備そなえて、代だい替たい品ひんを用よう意いしておく。

  Prepare substitute items in case of a disaster.