white-knuckle /ˈwaɪtˈnʌkəl/ adjective also white-knuckled /ˈwaɪtˈnʌkəld/ also white-knuckled /ˈwaɪtˈnʌkəld/ Learner's definition of WHITE-KNUCKLE
always used before a noun
: showing, experiencing, or causing very strong feelings of fear, anxiety, etc.神经紧张的；引起神经紧张的 -
a white-knuckle ride on a roller coaster胆战心惊的过山车乘坐体验
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I'm a white-knuckle flier/traveler. [=flying/traveling is very stressful for me]我怕坐飞机/旅行。
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They rode their motorcycles at white-knuckle speeds.他们骑摩托车的速度吓人。