围魏救赵（圍魏救趙）　

◎ 围魏救赵 wéiwèi-jiùzhào

[besiege Wei to rescure Zhao—relieve the besieged by besieging the base of the besiegers] 战国时,魏国围攻赵国都城,赵国向齐国求救,齐国乘魏国空虚,发兵攻魏,魏军回救本国,齐军乘其疲惫,在桂陵(今山东菏泽)大败魏军,赵国因而解围。后来用“围魏救赵”来指类似的作战方法