: a very popular or successful product, store, etc., that dominates competitors in a particular category
Their approach delivered search results that creamed the competition's, and it served them up in a simple, quick-loading, no-frills format. It was a stone-cold category killer.—
Lev Grossman, Time, 22 Dec. 2003
especially
: a chain store that dominates the sale of merchandise in a particular category (such as toys, sporting goods, or office supplies) by offering a large selection of products at discounted prices
The big discounters are following another set of retailers that have been making their mark throughout the five boroughs: the so-called category killers, who sell basically one type of merchandise, be it books, apparel, linen or electronic goods. —
Douglas Martin, New York Times, 11 Dec. 1994 Founded by Charles Lazarus in 1957, Toys "R" Us was the original "category killer"—industry jargon for a chain of large stores that offered low prices on almost every product and brand in its category and killed competing local retailers. —
Karl Taro Greenfeld, Time, 19 Oct. 1998
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Merriam-Webster unabridged
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