from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Slang Characterized by tense nervousness or apprehension: a white-knuckle emergency landing; white-knuckle time in the hospital waiting room.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Causing fear, excitement, apprehension, suspense, or nervousness.
Sorry, no etymologies found.