Out of the blue → 突然、意外、出乎意料

“Out of the blue”可以指意外发生的事情。

Out of the blue (phrase) - without warning; unexpectedly.

同义词: suddenly, unexpectedly, without warning, unanticipated

The news came out of the blue. → 消息突然传来。

He started crying out of the blue. → 他突然开始哭泣。

She called me out of the blue. → 她突然打电话给我。

The Love Hypothesis, by Ali Hazelwood, ch. 4

"Then, out of the blue, he said, 'I talked with the department chair this morning.'"

Agnes at the End of the World, by Kelly McWilliams, ch. 47

"'Agnes.' Jazz spoke out of the blue."

It Ends With Us, by Colleen Hoover, ch. 7

"... you show up again out of the blue! You show up at my work, you show up at my apartment door, you show up at parties, you..."