darken是一個英語動詞，基本意思是“使變暗，變黑”，引申還可指“憂郁，生氣，不快”。第三人稱單數：darkens；現在分詞：darkening；過去式：darkened；過去分詞：darkened。
例句：
1、It was a tragedy that darkened his later life.
這場悲劇給他后來的歲月蒙上了陰影。
2、The sky began to darken as the storm approached.
暴風雨來臨時天空變得黑沉沉的。
3、As the day darkened the streetlights came on.
天色漸暗，街燈亮了。