(informal)put all one's efforts into doing something to no avail
累死累活白干一场，忙得脸色发紫
she could talk to him until she was blue in the face, but he was just not hearing.
她可以和他谈到累死，可他只当没听见。
(informal)very rarely
(非正式)难得有一次，极为罕见
(N. Amer. informal)speak continuously and at great length
(北美，非正式)喋喋不休，没完没了地说，说个不停
To the point or at the point of extreme exasperation
脸色发青：至于或处于极度愤怒的状态
I argued with them until I was blue in the face.
和他们争论到我脸色发青
At a far distance; into the unknown.
远距离；遥不可测
From an unexpected or unforeseen source
出乎意料的：来自没有想到或没有预测的
criticism that came out of the blue.
突如其来的批评
At a completely unexpected time
突然的，始料不及的：在意料不到的时间里
arrived out of the blue.
突然拜访