‘脱销’ literally combines ‘脱’ (to detach, to remove) and ‘销’ (to sell, sales), conveying the idea that goods have completely detached from inventory—i.e., they’ve sold out. It’s a formal yet common verb used primarily in commercial contexts to describe products that are no longer available due to high demand or limited supply.

This term is often used in news reports, advertisements, and business discussions—not in casual daily speech where people might say ‘卖光了’ instead. It carries a neutral-to-positive connotation, implying popularity or desirability, especially when applied to consumer goods, books, concert tickets, or seasonal items. While it can be used transitively (e.g., 这款手机已脱销), it’s most frequently found in passive or perfective constructions with 已经, 很快, or 立即.