形容詞 off guard:

1. not prepared or vigilant
   同義詞：napping, off-guard, off one's guard, off his guard, off her guard, off your guard

1. Don't be off guard! You mustn't tell anything to him.
   不要失去警惕，你一定不要告訴他任何事情。
2. In the second that the boxer was off guard, his opponent landed a knock out punch.
   拳擊手未留意的那一剎那，對(duì)方即把他擊倒了。
3. If you should be off guard, you would double the loss.
   如果你粗心大意，你一定會(huì)加倍損失。
4. Seeing the opponent was off guarded, the boxer landed a knockout punch.
   乘對(duì)手不提防，那拳擊手一下子把他擊倒了。