off guard
柯林斯詞典
1. ADJ If someone is caught off-guard, they are not expecting a surprise or danger that suddenly occurs. 沒有提防的; 措手不及的[v n ADJ, v-link ADJ]
The question caught her completely off-guard and she did not know how to reply. 這個問題令她猝不及防，不知道怎麼廻答。
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