To exceed expectations; to be beyond what one anticipated.
出乎人们意料之外。
《南史·袁宪传》宪常招引诸生与之谈论新义，出人意表，同辈咸嗟服焉。”
His sudden resignation was completely out of everyone's expectation.
Learn the next connected idiom: 出人意料 (chū rén yì liào) → 料事如神 (liào shì rú shén)
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