Other forms: doorbusters
Sometimes you'll find a long line of people waiting for a store to open so they can take advantage of a doorbuster, a popular product being offered at a very low price. Doorbusters are an easy way to bring in customers.
A doorbuster gets its name from the fact that it causes a rush of customers, seemingly enough to break down the door! That's because the sale price usually applies only to a limited number of customers, such as the first 100. It may be a discount that lasts for just a few hours, so people are anxious to get in as quickly as possible, or there may be a very limited stock of the deeply discounted items. Depending on how attractive the sale item is, there could be a stampede. So if you're ever in such a lineup, be careful when the door opens!