category killer

/K AE1 T AH0 G AO0 R IY0 K IH0 L ER0/
noun
  1. 1

    A retailer that offers a wider selection of merchandise in a category than existing retailers, at lower prices, thereby gaining substantial share of the market and "killing" the existing retailers.

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Source: https://en.wiktionary.org/wiki/category%20killer