out of the blue

短语
大学

突然

发音

AU /aʊt ɒv ðə bluː/

教材释义与例句

短语

难得到的；突然；突如其来；出人意料

短语

出乎意料；突然地；一日狂徒

释义与例句

phr.
  1. 1.

    Unexpectedly; without warning or preparation.

    出其不意

    出乎意料

    习语

    After I hadn’t heard from her in six months, she called me out of the blue to meet for lunch.

    I really can't understand how something like this could simply pop up out of the blue.

词源

Short for out of the blue sky, likening an unexpected event to lightning or rain coming suddenly from a cloudless sky.

来源：wiktionary