Jump v. t. 1.To pass over by means of a spring or leap; to overleap; as, to jump a stream.
2.To cause to jump; as, he jumped his horse across the ditch.
3.To expose to danger; to risk; to hazard. (Obs.) "To jump a body with a dangerous physic."
4.(Smithwork) (a)To join by a butt weld.
(b)To thicken or enlarge by endwise blows; to upset.
5.(Quarrying) To bore with a jumper.
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.
jump v. i. (past & past part. jumped; pres. part. jumping) 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. "Not the worst of the three but jumps twelve foot and a half by the square."
2.To move as if by jumping; to bounce; to jolt. "The jumping chariots." "A flock of geese jump down together."
3.To coincide; to agree; to accord; to tally; followed by with. "It jumps with my humor."
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.
Jumping adj., n. Of Jump, to leap. 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 Psyllidae, 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 Saltigradae; so called because it leaps upon its prey.
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