What is said cannot be easily unsay.

说出来的话不易取消.

《现代英汉综合大词典》

How I longed for the power to unsay my tactless words!

我真的渴望能收回自己那无知的言语!

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To retract ( something spoken ); unsay.

收回 ( 所说的某些话 ); 撤回(前言)

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The words escaped, and he could neither unsay his promise nor her request.

现在话已出口,朱庇特既不能算她没提要求, 又不能收回自己的誓言.

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The words escaped , and Jupiter could neither unsay his promise nor her request.

现在话已出口,朱庇特既不能算她没提出要求, 又不能收回自己的诺言.

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