Taivo A Taiwan Mandarin dictionary

出其不意

chūqíbùyì

ㄔㄨ ㄑㄧˊ ㄅㄨˋ ㄧˋ

  1. 1to do sth when least expected (idiom); to catch sb off guard

Keep 出其不意 and it comes back until you know it.

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