V-T/V-I If something darkens or if a person or thing darkens it, it becomes darker. 变暗; 使变暗
The sky darkened abruptly.
天突然变暗了。
V-T/V-I If someone's mood darkens or if something darkens their mood, they suddenly become unhappy. 黯淡; 使黯淡 [文学性]
My sunny mood suddenly darkened.
我快乐的情绪突然黯淡下来。
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