丧失警惕, 不提防

off guard的用法和样例：

例句

Don't be off guard! You mustn't tell anything to him.不要失去警惕，你一定不要告诉他任何事情。
In the second that the boxer was off guard, his opponent landed a knock out punch.拳击手未留意的那一刹那，对方即把他击倒了。
If you should be off guard, you would double the loss.如果你粗心大意，你一定会加倍损失。
Seeing the opponent was off guarded, the boxer landed a knockout punch.乘对手不提防，那拳击手一下子把他击倒了。

词汇搭配

catch off one's guard使人措手不及...
put someone off his guard使某人失去警惕...
throw someone off his guard使某人失去警惕...
catch bending off guard使人措手不及...

【近义词】

off your guard不警戒(不警惕...
off her guard不警戒(不警惕...
off his guard不警戒(不警惕...
napping不警戒的
off one's guard没有提防
off-guard毫无准备的

【反义词】

on guard值班

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