In Greek, "olisthesis" means to slip.
Posterior listhesis is a "slip" or compression on the vertebrae of the spine. This can be caused by many different factors from illness to degenerative diseases to injury.
Displacement of a disc.
The medical terminology combining form meaning slipping is "lux/o." This combining form is often used in medical terms related to the displacement or slippage of a body part, such as "spondylolisthesis" which refers to the forward slipping of a vertebra in the spine.