noun which may take the genitive case particle 'no', noun
backordered; awaiting stock
Used for items that are currently out of stock and waiting for a new shipment. Common in retail and online shopping contexts.
This item is on back order.
Backordered items will be shipped as soon as they arrive.
在庫切れ is a more formal term for 'out of stock', often used in business contexts, whereas 入荷待ち is common in consumer-facing retail.
Compound of 入荷 (arrival of goods) + 待ち (waiting).