一言既出，驷马难追

yìyánjìchū,sìmǎnánzhuī

a word once spoken cannot be taken back even by a team of four horses—what is said cannot be unsaid

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yi1 yan2 ji4 chu1 , si4 ma3 nan2 zhui1

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

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一言既出，駟馬難追|一言既出，驷马难追 [yī yán jì chū , sì mǎ nán zhuī] ► lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept