Often used to describe things that aren't physical, like feelings or time, gradually diminishing. As years passed, the memories of high school faded out.
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Endings
Implies the gradual end of an event or situation, not an abrupt stop. The party slowly faded out as guests began to leave.
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Negative Emotion
Can express a sense of loss or emptiness when something fades from existence. Hope faded out when the rescue team found no survivors.