jack-up rig

noun

an offshore drill rig or platform having a floating hull fitted with retractable legs that can be lowered to the seabed to elevate the hull above wave level.

Compare semisubmersible.

Origin of jack-up rig

First recorded in 1965–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018