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doorbuster (noun) – (1)(a) (Informal) A retail item that is heavily discounted for a very limited time in order to draw customers to the store.
(b) the price of such an item.

2, A device used to forcibly open a door.

Source : Dictionary.com

Etymology : Doorbuster originally (in the 1890s) meant ?one who breaks into or forces his way into a room or building.? By the first part of the 20th century, doorbuster also meant ?a retail item heavily discounted for a short time to attract customers,? and towards the end of the 20th century, a doorbuster meant ?a tool or device to force doors open.? The words bust and buster arose in the mid-17th century as regional or colloquial pronunciations of burst and burster, as also happened with curse and cuss, arse and ass, and parcel and passel.