darken
英 ['dɑːk(ə)n]
美['dɑrkən]
	    - vt. 使变暗;使模糊
 - vi. 变黑;变得模糊
 
英英释意
- 1. become dark or darker;
 - "The sky darkened"
 
- 2. become or make darker;
 - "The screen darkend"
 - "He darkened the colors by adding brown"
 
- 3. tarnish or stain;
 - "a scandal that darkened the family's good name"
 
- 4. make dark or darker;
 - "darken a room"