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jumping bean the seed of certain Mexican plants of the spurge family, which contains the larva of a small moth whose movements cause the seed to roll and jump.
jumping jack a continuous exercise in which one moves the legs apart and the arms above the head with one jump, then brings the legs together and the arms to the sides with the next. [2 definitions]
jumping mouse any of various small rodents with large hind legs and a long tail.
jumping-off place an isolated or remote area, considered as the edge of civilization. [2 definitions]
jump on the bandwagon to join a party, cause, or movement because it seems assured of success, especially during an election.
jump rope a length of rope held at each end and swung under the feet and over the head as one jumps, for exercise or as a game.
jump seat a small folding seat in an automobile or airplane.
jump shot in basketball, a shot made by a player at the highest point of a jump.
jump-start to start (a motor vehicle) either by rolling or pushing (it) with the ignition on and suddenly releasing the clutch, or by connecting the dead battery to a live battery with jumper cables. [2 definitions]
jump suit a one-piece garment worn by parachutists. [2 definitions]
jump the gun to start something prematurely.
jumpy nervous or edgy, as with fear or anxiety. [2 definitions]
jun the smaller monetary unit of North Korea; chon. (Cf. won.)
junco any of a variety of small North American finches having gray and white plumage; snowbird.
junction a point or place where things are joined together. [5 definitions]
juncture a particular point in time, esp. a point of serious importance or crisis. [3 definitions]
June the sixth month of the Gregorian calendar year, having thirty days.
Juneau the capital of Alaska.
juneberry an American shrub or tree of the rose family, bearing white flowers and purplish fruit. [2 definitions]
June bug any of several large brown or iridescent green beetles of the eastern United States which appear in late spring and early summer.
jungle land covered with very dense natural vegetation, esp. a tropical rain forest. [4 definitions]