Technically any shoulder to overhead movement in which the athlete first accelerates the bar up by driving the legs, and then drives under the bar to receive it with locked elbows. "Jerk" with no other qualifier implies the athlete's chosen jerk style for maximal weight, which will nearly always be a split jerk.
With a barbell in the jerk rack position, bend the knees to bring the hips straight down (no torso lean) and quickly reverse to drive the bar up as you push yourself underneath, catching with locked arms in a lunge position.
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