darken
/ˈdɑ:kən; `dɑrkən/ v[I, Tn]
1 (cause sth to) become dark （使某物）变黑暗
We darkened the room to show the film. 我们把房间弄暗以放影片.
The sky darkened as the storm approached. 风雨欲来, 天色黑暗.
2 (idm 习语) darken sb's `door (joc or rhet 谑或修辞) come as an unwanted or reluctant visitor to sb's house 不受欢迎的人到访
Go! And never darken my door again! 走吧! 下次不要再到我家来了!