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white-knuckle

[hwahyt-nuhk-uh l, wahyt-]
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adjective Informal.
  1. causing fear, apprehension, or panic: The plane made a white-knuckle approach to the fogged-in airport.
  2. experiencing fear, terror, or apprehension: The white-knuckle crowd loved that director's newest horror movie.
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Often white-knuck·led.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for white knuckle

white-knuckle

adjective
  1. causing or experiencing fear or anxietya white-knuckle ride
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012