(transitive) To double the quantity, amount or duration of something / (poker, by extension, intransitive) To double one's amount of chips by winning an all-in pot.

Doublespeak. / Lies, especially in a formal political statement. / (comedy) Speech which combines English (or some other language) and native-sounding gibberish for humorous effect.

(basketball) The achievement of a two-digit number of any three of points scored, assists, rebounds, blocks, or steals in a single game.

(basketball) The achievement of a two-digit number of all five of points scored, assists, rebounds, blocks, and steals in a single game.

(basketball) The achievement of a two-digit number of any four of points scored, assists, rebounds, blocks, or steals in a single game.

A phrase that has two meanings, especially where one is innocent and literal, the other risqué, bawdy, or ironic; an innuendo.

Used other than figuratively or idiomatically: see double, barrelled. Having two barrels, as a gun. / Twofold, having a double purpose or nature.

(chemistry) a reaction between two substances in which two parts of each substance are exchanged; metathesis

two pairs of railway switches forming two connections that cross over between two parallel tracks

(film, television) A type of body double: a skilled stand-in used for dangerous film or video sequences such as jumping out of a building, leaping from vehicle to vehicle, and fight sequences.