To happen unexpectedly; beyond one's expectations.
指出人意料。
毛泽东《发刊词》准备对付可能的突然事变，使党和革命不在可能的突然事变中遭受出乎意料的损失。”
His sudden resignation was completely out of the blue.
Learn the next connected idiom: 出乎意料 (chū hū yì liào) → 料事如神 (liào shì rú shén)
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