一言既出，驷马难追一言既出，駟馬難追

yī yán jì chū , sì mǎ nán zhuī

释义

lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept

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汉字

一yīone; a, an; alone 言yánwords, speech; to speak, to say亠二口既jìalready, since, then; both; de facto旡出chūto go out, to send out; stand; produce屮凵驷sìa team of four horses马四马mǎhorse; surname一难nánhard, difficult, arduous; unable又隹追zhuīto pursue, to chase after; to expel辶丿㠯