a bolt from/out of the blueEXPECTnews that is sudden and unexpected 突如其来的消息;晴天霹雳 Was this money a bolt from the blue or did you know you were going to get it? 这是一笔意料之财呢,还是你本来就知道会有的?
a bolt from/out of the blue• Even so, dismissal should never come as a bolt from the blue, however exalted your place in the corporate hierarchy.• The Mishcon job came like a bolt from the blue.• Inspiration hit me like a bolt from the blue on the way home.
→ a bolt from/out of the blue at bolt1(1)