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double consisting of two times as much; having twice the amount or number. [19 definitions]
double agent a spy employed by both of two opposed or competitive countries, companies, or the like.
double bar two heavy vertical lines on a musical staff used to indicate the end of a piece or of a major subdivision of a piece.
double-barreled having two barrels mounted side by side, as a shotgun. [2 definitions]
double bass the largest and deepest-toned instrument of the violin family; bass viol; contrabass.
double bassoon see contrabassoon.
double bind a situation in which a person can satisfy one expectation or demand only by failing to satisfy another; dilemma.
double-blind of or designating a method of testing in which both the experimenter and the subjects are ignorant of which subjects are receiving the active treatment.
double boiler a pot consisting of a lower part, in which water is boiled to create steam, and an upper part that fits snugly into the top of the lower, in which food can be cooked, warmed, or melted slowly.
double-breasted having the sides overlap each other by a wide margin on the breast or front, and usu. having a double vertical row of buttons, as a jacket or coat. (Cf. single-breasted.) [2 definitions]
double-check to verify, as by checking twice; recheck. [2 definitions]
double check to check something twice to make sure that it is correct.
double chin one or more fatty folds of flesh beneath the chin.
double click to press the button of a computer mouse twice.
double-cross (informal) to betray or cheat by acting contrary to a previous agreement.
double cross (informal) a betrayal or swindle accomplished by a course of action contrary to that previously agreed upon with the victim. [2 definitions]
double dagger a sign consisting of a small vertical line crossed by two smaller horizontal lines, used as a reference mark, as for a footnote; diesis.
double date (informal) in the United States, a social outing shared by two couples.
double-date to participate in a double date.
double-dealing an act of deception, duplicity, or treachery. [2 definitions]
double-decker a bus, ship, or other conveyance that has two tiers or decks for passengers. [3 definitions]