| 词汇 | out-of-the-blue |
| 释义 | out of the blueidiom C1 If something happens out of the blue, it is completely unexpected: 出乎意料地;突然 One day, out of the blue, she announced that she was leaving.有一天，她突然宣布要走。 Not expected or planned abrupt end abrupt halt abruptly abruptness ad hoc inadvertence inadvertency inadvertent inadvertently inconceivable sine die spirit spontaneity spontaneous spontaneously unsuspected untimely untoward unwilled unwitting out of the blue | American Dictionaryout of the blueidiom unexpectedly: My old roommate called me out of the blue. |
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