Definition
To be available for purchase in stores, indicating that a product or item is on sale.
上市（商品）
The new phone model will be in the shops next month.
新款手机下个月将在商店上市。
With the arrival of summer, more swimwear is now in the shops.
随着夏天的到来，更多泳装已在商店上架。
The limited edition book will be in the shops next week.
限量版书籍将于下周在商店上架。