(nonstandard) simple past tense and past participle of double down

To insist, demand, or refuse with finality. / (informal, literally) To make a vehicle go faster; accelerate.

(idiomatic) Caught off guard, unprepared, or in an embarrassing situation.

(idiomatic, chiefly US) To deal with the important details.

(idiomatic) To follow or supervise someone too closely, causing discomfort for that person.

(idiomatic) To make things worse for someone who is going through a difficult time.

(idiomatic) To relax and enjoy oneself.

(UK, slang) Hard at work; preparing oneself to work hard.

(poker slang) A poker hand that has four cards to a straight, where there are two different ranked cards that will complete the straight. E.g. 4-5-6-7, either a 3 or 8 could make a straight. It is used only when the player has not yet received all the cards she will receive for a particular hand.

(poker, slang) An open ended straight draw