做牛做馬 [ㄗㄨㄛˋ ㄋㄧㄡˊ ㄗㄨㄛˋ ㄇㄚˇ; zuo4 niu2 zuo4 ma3] lit. to work like an ox, to work like a horse; fig. to work extremely hard ◄ ►
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