off guard
柯林斯词典
1. ADJ If someone is caught off-guard, they are not expecting a surprise or danger that suddenly occurs. 没有提防的; 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. 这个问题令她猝不及防,不知道怎么回答。
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