Idiom: "(to) break the news"  

Definition:

to make something known

Examples:

1) Sam and Jane are getting divorced, but they haven’t broken the news to their parents yet.

2) After he broke the news to his family about his new promotion, they went out to celebrate.

中文解释： http://www.youzienglish.com/main/idiom_of_the_day/103/cn