There are 2 definitions of jump off in English:

jump off1

(Of a military campaign) begin: the air-attack phase will continue before the ground attack jumps off
More example sentences
  • On the morning of 13 May, the 6th Marine Division attack was scheduled to jump off at 0730.
  • The attack jumped off six hours later.
  • The final assault jumped off at 1515 from a crossroads 500 yards south of Clochimont.
See parent entry: jump

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Word of the day salmanazar
Pronunciation: ˌsalməˈneɪzə
noun
a wine bottle twelve times the standard size...

There are 2 definitions of jump off in English:

jump-off2

Syllabification: jump-off

noun

A deciding round in a show-jumping competition.
More example sentences
  • Out of the starting field, only six horse-and-rider combinations went clear in the first round to qualify for the jump-off.
  • One penalty point separated gold medalists Germany from Switzerland in the equestrian team showjumping, while Brazil beat France in a jump-off for the bronze.
  • In the jump-off, riders compete against the clock, as well as the course.

Definition of jump off in: