job locknoun.
The fear of leaving a job because it might mean losing or reducing health care benefits.
Example Citation:
"There's no shortage of sad stories about health insurance. But for pure frustration, nothing beats job lock: being frozen in a job you hate because leaving it means losing key health benefits. You're stuck because you have a bad knee, your daughter has diabetes or your wife has emphysema. No new insurer wants your family unless it can draw a big red circle around your maladies and refuse to cover everything inside."
Ellyn E. Spragins, "How to Beat Job Lock," Newsweek