鞭打快牛

biāndǎkuàiniú ㄅㄧㄢ ㄉㄚˇ ㄎㄨㄞˋ ㄋㄧㄡˊ

    • to overburden the most capable or hardworking while sparing others

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
whip the fast ox
Meaning
To pile excessive demands on the most capable or hardworking, while others are spared. Critical.

Sources