verb · to become debased or reduced in value, particularly in the context of coinage

在古代，私铸钱币往往会导致货币减色。

verb · to fade or lose color intensity

这种布料洗几次就减色了。

verb · to lose attractiveness, quality, or appeal; (of an event) to be spoiled or diminished

缺乏背景音乐使这场演出减色不少。