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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.
The political candidate claimed that 99% of the violent crimes committed in the United States were perpetrated by Canadians. When challenged with data indicating that in fact less that 0.1 percent of crimes are committed by Canadians, the candidate opted to double down, claiming that the data was incorrect. Further, the candidate pledged to, if elected, expel all US citizens with Canadian ancestry from the country.
by Sonicoed June 11, 2017
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2
to engage in risky behavior, especially when one is already in a dangerous situation.

This figurative usage as appearing in the Oxford English Dictionary is a meaningful explanation of “double down” other than the ubiquitous “to double the wager in exchange for only one additional card in Blackjack gambit” in every online dictionary.
Don’t try to double down the exposures of your retirement money in aggressive investments

It is the time to double down on the commitment of solar energy, rather than to scale back

HP is going to double down on Palm’s webOS
by vanderpol August 04, 2010
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Being upset about 1 thing, then creating another problem because you're distraught about the first problem
Dude,

"My boss fired me and I went home and Doubledowned on my girlfriend so she split on me"
by Jonfurstn May 10, 2009
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1. Having sex with more then one person at once, most usually a girl taking on two guys and even more specifically alternating between blowing one and the other.

2. In blackjack, to double your current bet at your turn, in return for which you get one more card and then no more. In what situations this is allowed and/or advicable varies somewhat depending on the casino, but if no card counting is done, it's usually a good move on all hands totaling 11 and some totaling 10.
Hey Sue, heard you doubled down last night.

11 to the dealers 6? Double down, no question.
by Patrik Lundin October 05, 2004
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Double down describes how down a person is to do something. You're not just 'down' , you're so down, that you're double down.
Yo Dylan, you down to go to 7-11?
Yeah yo I'm double down.
by Alcazar805 August 08, 2014
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Oral Sex with a man that involves the full spectrum of male genitalia, including but not limited to the penis, balls, and perineum.

Named for the likeness to the KFC sandwich, i.e. salty, cheese, and all meat.
Verb:

Stephanie didn't just go down on him; she went double-down.

Noun:

Man, I could really go for a double down right about now.
by evan & joe July 19, 2010
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