back order

noun
🔊/ˈbæk ɔːdə(r)/
🔊/ˈbæk ɔːrdər/
[countable, uncountable]
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  1. an order for a product that is not currently available
    • You may either place a back order or choose an alternative product.您可以下订单或选择其他产品。
    • on back order Those items are on back order.这些物品都缺货。