jump off1
(Of a military campaign) begin: the air-attack phase will continue before the ground attack jumps off...
- The attack jumped off at Honnef, 10 April.
- The First Infantry Division attack jumped off at 0600.
- The mines were cleared without casualty, and the Marine assault jumped off at 1000.
See parent entry: jump
jump-off2 
noun
A deciding round in a showjumping competition.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.
- make a name for oneself
- make an ass of oneself
- make-and-break
- make an effort
- make an end of
- make an enemy of
- make an example of
- make an exhibition of oneself
- make an honest woman of
- make an issue of
- make a noise
- make an (or one's) entrance
- make a (or no) difference
- make a (or one's) fortune
- make a (or one's) pile
- make a pig of oneself
- make a pig's ear of
- make a pitch
- make a plan
- make a play for
- make a point of
- make a present of
- make a production of
- make a (quick) quid
- make a rod for one's own back