屋漏偏逢連夜雨 When it rains, it pours
Story and comic created by CCFamily.
"When it rains, it pours" is an English idiom meaning when one thing goes wrong, many other things go wrong too. You say it when several similar, especially bad or annoying things haven't happened for a long time, and then they happen all at once.
1. I had a terrible weekend! My alarm clock was out of order, there was a traffic jam and then I missed the flight! When it rains, it pours!
2. Many of the classmates are sick at the same time. When it rains, it pours!
3. Sometimes there is no homework for the whole week, but sometimes there are a lot in one day. When it rains, it pours!
Reference: Cambridge Dictionaries Online (Learners')