White-knuckle Definition
 wītnŭkəl, hwīt- 
    adjective
  
 Characterized by tense nervousness or apprehension.
 A white-knuckle emergency landing.
 American Heritage 
Of or causing great fear, suspense, dread, etc.
 Webster's New World 
(idiomatic) Causing fear, excitement, apprehension, suspense, or nervousness.
Wiktionary 
Alternative spelling of white-knuckle.
Wiktionary 
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