Question of the Day #764

Breakthroughs in technology emerge out of the blue from time to time.

From the first line of this article at AARP.org.

上記の文で、out of the blueの意味は？
In the sentence above, what does "out of the blue" mean?

答えは、コメントに書いてください。
Write your answer in the Comments.

明日、ここに答えを書きます。
I will add the answer and other remarks here tomorrow.

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解答

意味：
英辞郎によると、

思いがけなく、突然、いきなり、出し抜けに、不意に、前ぶれ［予告］なしに、藪から棒に、唐突に

問題文の場合は、emerge out of the blueでcome out of the blueと同じ意味のため、「青天のへきれきである」と訳してもいいと思います。

Answer

According to The Free Dictionary:

Completely unexpectedly.

Examples

• One of them wrote to us out of the blue several years later.
• She seemed so surprised by the news that it must have come out of the blue.
• She had no idea that anything was wrong until he announced out of the blue that he wanted a divorce.
• One day, out of the blue, she announced that she was leaving.
• And my winning ride came out of the blue; you can often win when you are least expecting to. The Sun (2013)

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