投鞭斷流（投鞭斷流）　

◎ 投鞭斷流 tóubiān-duànliú

[(of forces) numerous and powerful;with a strong army that,if the soldiers throw their whips into the river,it would be enough to stem the current] 中國前秦的苻堅(jiān)進(jìn)攻東晉時(shí)驕傲地說,我這么多的軍隊(duì),把每個(gè)兵的馬鞭子都投到江里,就能截?cái)嗨?見于《晉書·苻堅(jiān)載記》)。后用來比喻人馬眾多,兵力強(qiáng)大