Even four horses cannot take back what one has said.

一言既出,驷马难追.

《现代汉英综合大词典》

So then it was too late to retract.

但一言既出,驷马难追.

辞典例句

He had decided, and it was irrevocable.

他决心已定, 驷马难追.

辞典例句

As the saying goes, a word spoken can never be taken back.

古语说, 一言既出,驷马难追.

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