爱华网be caught off guard;be caught unprepared;be taken by surprise;be put off one's guard ;
【解释】：猝：突然，出其不意。形容事情来得突然，来不及防备。
【出处】：清·纪昀《阅微草堂笔记·姑妄听之一》：“既不炳烛，又不扬声，猝不及防，突然相遇，是先生犯鬼，非鬼犯先生。”
【用法】：偏正式;作谓语、定语、状语。
【注意点】：“及”不要请写成“急”。
【近义词】：措手不及、惊惶失措、手足无措等。
【反义词】：防患未然、未雨绸缪等。
中英例句分析人士指出，对金正日去世一事猝不及防的不仅仅是韩国。
Analysts noted that it wasn't just south korea that was blindsided.
美国国债价格大幅反弹，推动利率跌至年内最低水平，这令很多投资者猝不及防，也暗示了市场对经济持续疲软的担心仍然存在。
让人猝不及防的击剑比赛
Treasurys have staged an outsize rally, driving interest rates to the lowest point of the year, catching many investors offguard and suggesting fear of continued economic weakness remains.
丑闻已经使该公司股价跌去70%，让日本生命保险(nippon life)和东南资产管理(southeastern asset management)等主要机构投资者猝不及防。
The scandal has knocked 70% off the company's share price and caught off-guard major institutional funds such as nippon life and southeastern asset management.
