doubling down

Originally a term used in the card game blackjack, where a player doubles their original bet in exchange for exactly one additional card; most useful when the remaining deck is offering extremely favorable odds of making a total of twenty-one. The term is increasingly used as a media euphemism when political figures tell bald-faced lies and when confronted with contradictory statements, the politician not only fails to retract their claims but instead expresses an increased certainty in their truth.