chaperone effect
n.— «Snyder believes that the stem cells held in these “biobridge” scaffolds produce a positive effect by nurturing and sustaining the nerve cells in the recipient rodent. This is what he and other scientists refer to as the “chaperone effect.”» —“Stem cell scaffolds repair rodent spinal cord damage” by Roxanne Khamsi New Scientist Feb. 18, 2006. (source: Double-Tongued Dictionary)
Further reading
What’s the best way for someone busy to learn lots of new words quickly for a test like the GRE? Looking up their origins can help. Or, record yourself reading the words and definitions and play them back while you’re doing other chores...
Michelle in Fort Worth, Texas, says she answers nosy relationship questions with single as a jaybird, meaning comfortably unpartnered. That exact phrase isn’t common, but it fits a larger pattern: speakers detach as a jaybird from the familiar naked...