Definition from Wiktionary, the free dictionary
funnel; to leak; to let out; to divulge
one-sided; to lean; to slant; prejudiced; inclined to one side
|every time; meet by chance||
(surname); even; as; join; to link; successively
Literally: When the roof is leaking, that's when you'll get several continuous nights of rain.
屋漏偏逢連夜雨 (traditional, Pinyin 屋漏偏逢连夜雨), simplified