(zoology) A jumping mouse found in moist habitats throughout much of Canada and the northeastern United States, Zapus hudsonius.

(colloquial) An extra seat in an aircraft cabin or cockpit for someone other than a passenger. / (dated) A movable seat in a carriage.

A parachute jump from a fixed point rather than from an aircraft; typically from a tall building, high bridge or rock formation.

(intransitive) To make such a jump.

An instance of bungee jumping.

(intransitive) To participate in bungee jumping.

(sports) To begin a race too soon, before the starting gun goes off. / (idiomatic) To act or begin too soon or without due caution.

(idiomatic, of a television program or other narrative) To undergo a storyline development which heralds a fundamental and generally disappointing change in direction.

Used to introduce an inline advertisement in a webpage etc.

Alternative form of jump-start