HSK 7-9
昏
hūn动
muddle-headed; twilight; to faint; to lose consciousness
他因缺氧突然昏了过去。
Tā yīn quē yǎng tū rán hūn le guò qù.
He suddenly fainted from a lack of oxygen.
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Appears across levels (7-9) in the HSK 3.0 word list.