Definition of jump off in English:

jump off

(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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