中英成语俚语800对162：攻其不备

　　攻其不备

　　Take one off his guard.

　　To catch a weasel asleep.

　　eg：The sudden attack took the enemy napping and ran.

　　中英俚语俗语来源：孙子·计篇："攻其不备，出其不意。"

　　同义词：乘虚而入 Swoop down upon.

　　反义词：鸣鼓而攻之 Beat a charge.