前仆後繼

Simplified: 前仆后继

qiánpūhòujì ㄑㄧㄢˊ ㄆㄨ ㄏㄡˋ ㄐㄧˋ

    • one falls, the next follows (idiom) stepping into the breach to replace fallen comrades
    • advancing wave upon wave

Character by character

Sources