圍魏救趙 [ㄨㄟˊ ㄨㄟˋ ㄐㄧㄡˋ ㄓㄠˋ; wei2 wei4 jiu4 zhao4] to besiege 魏[ㄨㄟˋ; wei4] and rescue 趙[ㄓㄠˋ; zhao4] to relieve a besieged ally by attacking the home base of the besiegers (idiom) ◄ ►