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Verb: double down
  1. To increase one's commitment to a particular strategy or course of action
    "Despite criticism, the CEO doubled down on the company's expansion plans"
Noun: double down
  1. (in blackjack) to double the initial bet in exchange for only one more card
    "He decided to double down on his hand of eleven"

Derived forms: doubled down, doubles down, doubling down

Encyclopedia: Double down