Unjack

jack to hold the same for treatment, and means acting automatically to unjack the shoe as the support or jack is moved outward on said table

Jackup platforms of small dimensions are usually severely limited by weather conditions, since they are unstable and dangerous to unjack when wave heights are greater than a few feet.

She gave it a go, with no luck. "I'm freezing. I've got to get back inside." "Then we're screwed. You can't." "Un-jack this fucking thing, I'm going in."