2. To cause to jump; as, he jumped his horse across the ditch. [ 1913 Webster ]

3. To expose to danger; to risk; to hazard. [ Obs. ] [ 1913 Webster ]

To jump a body with a dangerous physic. Shak. [ 1913 Webster ]

4. (Smithwork) (a) To join by a butt weld. (b) To thicken or enlarge by endwise blows; to upset. [ 1913 Webster ]

5. (Quarrying) To bore with a jumper. [ 1913 Webster ]

To jump a claim, to enter upon and take possession of land to which another has acquired a claim by prior entry and occupation. [ Western U. S. & Australia ] See Claim, n., 3. --
To jump one's bail, to abscond while at liberty under bail bonds. [ Slang, U. S. ] --
To jump the gun, to begin to run (in a footrace) before the starting gun has fired; hence, (fig.) to begin any activity before the designated starting time. [ 1913 Webster +PJC ]

2. An effort; an attempt; a venture. [ Obs. ] [ 1913 Webster ]

Our fortune lies
Upon thisjump. Shak. [ 1913 Webster ]

3. The space traversed by a leap. [ 1913 Webster ]

4. (Mining) A dislocation in a stratum; a fault. [ 1913 Webster ]

5. (Arch.) An abrupt interruption of level in a piece of brickwork or masonry. [ 1913 Webster ]

6. A jump-start; as, to get a jump from a passing mmotorist. [ PJC ]

From the jump, from the start or beginning. [ Colloq. ] --
Jump joint. (a) A butt joint. (b) A flush joint, as of plank in carvel-built vessels. --
Jump seat. (a) A movable carriage seat. (b) A carriage constructed with a seat which may be shifted so as to make room for second or extra seat. Also used adjectively; as, a jump-seat wagon. [ 1913 Webster ]

1. To spring free from the ground by the muscular action of the feet and legs; to project one's self through the air; to spring; to bound; to leap. [ 1913 Webster ]

Not the worst of the three but jumps twelve foot and a half by the square. Shak. [ 1913 Webster ]

2. To move as if by jumping; to bounce; to jolt. “The jumping chariots.” Nahum iii. 2. [ 1913 Webster ]

A flock of geese jump down together. Dryden. [ 1913 Webster ]

3. To coincide; to agree; to accord; to tally; -- followed by with. “It jumps with my humor.” Shak. [ 1913 Webster ]

To jump at, to spring to; hence, fig., to accept suddenly or eagerly; as, a fish jumps at a bait; to jump at a chance. [ 1913 Webster ]

2. A sleeveless one-piece dress, either with full shoulders or straps, sometimes with only the front part of the bodice, usually worn by women with a blouse underneath. [ PJC ]

2. (Electronics) a short wire, or a small plastic object containing such a short wire, used to optionally connect or disconnect two points in an electronic circuit, so as to include or exclude portions of the circuit and thus modify the function of the circuit. Such jumpers are much used to adapt add-on circuit boards for different conditions or functions within a computer. The contacts to which jumpers connect in commercially produced circuit boards are typically two closely spaced short stiff wires standing perpendicular to the plane of the circuit board, and the jumper has two holes with spacing identical to that of the contacts wires, so as to allow convenient insertion or removal of the jumper. [ PJC ]

2. A long drilling tool used by masons and quarrymen. [ 1913 Webster ]

3. A rude kind of sleigh; -- usually, a simple box on runners which are in one piece with the poles that form the thills. [ U.S. ] J. F. Cooper. [ 1913 Webster ]

4. (Zool.) The larva of the cheese fly. See Cheese fly, under Cheese. [ 1913 Webster ]

5. (Eccl.) A name applied in the 18th century to certain Calvinistic Methodists in Wales whose worship was characterized by violent convulsions. [ 1913 Webster ]

6. (Horology) spring to impel the star wheel, also a pawl to lock fast a wheel, in a repeating timepiece. [ 1913 Webster ]

Baby jumper. See in the Vocabulary. --
Bounty jumper. See under Bounty. [ 1913 Webster ]

Jumping bean, a seed of a Mexican Euphorbia, containing the larva of a moth (Carpocapsa saltitans). The larva by its sudden movements causes the seed to roll to roll and jump about. --
Jumping deer (Zool.), a South African rodent (Pedetes Caffer), allied to the jerboa. --
Jumping louse (Zool.), any of the numerous species of plant lice belonging to the family Psyllidæ, several of which are injurious to fruit trees. --
Jumping mouse (Zool.), North American mouse (Zapus Hudsonius), having a long tail and large hind legs. It is noted for its jumping powers. Called also kangaroo mouse. --
Jumping mullet (Zool.), gray mullet. --
Jumping shrew (Zool.), any African insectivore of the genus Macroscelides. They are allied to the shrews, but have large hind legs adapted for jumping. --
Jumping spider (Zool.), spider of the genus Salticus and other related genera; one of the Saltigradæ; -- so called because it leaps upon its prey. [ 1913 Webster ]

2. A calisthenic exercise in which a person starts in a standing position with both feet together and with the arms at the sides, then leaps into the air while moving the arms outward and upward so that the hands touch above the head, and then returns to the original position by reversing the motion of legs and hands. [ PJC ]

2. To provide a speedy start to (an activity) using the assistance of some external impetus; to re-energize (an activity proceeding sluggishly); -- accomplished by application of a stimulus not normally used in the activity. [ Figurative ] [ PJC ]

2. a one-piece garment resembling a jumpsuit{ 1 }, having a shirt or blouse attached to trousers or shorts. [ PJC ]