不见天日比喻社会黑暗，见不到一点光明。

出自宋·魏泰《东轩笔录》卷八：“福州之人，以为终世不见天日也，岂料端公赐问，然某尤为绛所苦者也。”

那么不见天日用英语怎么说？

不见天日可以用never to see the sun or the sky，suffering oppression，under the dark rule来表示，例如：

1.如果这位母亲没有这么做，这个孩子会被放在一个小屋的密封房间里，然后他会真正意义上地不见天日。
If the mother doesn't actually abandon the child, the child is kept in a backroom in a shack and literally does not see the light of day. 

2.“2006年海洋生命普查小组”远征队的队员在南极洲水域极厚的冰层之下，拍摄到了这种数千年不见天日的生物。
Discovered during a 2006 Census of Marine Life expedition, this species was filmed in Antarctic waters that have been kept in darkness for thousands of years by thick ice cover. 

3.以上北京鸽子市场的纪录，如同千千万万其他的文件，几十年来一直不见天日。 这些资料是国家机密，因为中国政府不愿意指出过失。
The records on the Beijingpigeon market, like thousands of other Cultural Revolution documents, lay silent for decades, deemed state secrets by a government hardlyeager to highlight Mao’s excesses. 

4.比起2005年到2006年间那些不见天日的日子 伊拉克的安全状况得到了极大的改善 但是关于未来的几个月甚至几年伊拉克会变成什么样子 大家众说纷纭.
Security in Iraq has improved enormously since the darkest days of 2005-2006, but the jury is still out on what will happen in the months and years ahead. 

5.起初，就好像看见集中的小点，“现在可比原先清楚多了，”Terry Bryant，一个58岁受测试者说。 他经历了13年不见天日的生活后，于2002年植入了“仿生眼”。
At the beginning, it was like seeing assembled dots "now it's much more than that, " says Terry Bryant, aged 58, who received the implant in 2002 after 13 years of blindness.