from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A period of uncertainty during which the inevitable consequences of a current situation are postponed or avoided. Often used with on: terminally ill patients living on borrowed time; an unstable government that existed for months on borrowed time.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A period of time whose precise duration is not known but which can be expected to be quite limited, and at the end of which one's situation, benefits, or opportunities will be entirely terminated.
Sorry, no etymologies found.