double down

verb

Definition of double down 

intransitive verb

1 : to double the original bid in blackjack in exchange for only one more card

2 : to become more tenacious, zealous, or resolute in a position or undertaking the administration needs to double down on the call for political reformWashington Post

First Known Use of double down

1949, in the meaning defined at sense 1

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The first known use of double down was in 1949

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