altitude sickness

noun
🔊/ˈæltɪtjuːd sɪknəs/
🔊/ˈæltɪtuːd sɪknəs/
[uncountable]
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  1. illness caused by a lack of oxygen, because of being very high above sea level, for example on a mountain高山病,高原病(由缺氧引起)