Once a word is spoken, it is difficult to chase it back

Pinyin:

yī yán jì chū; sì mǎ nán zhuī

Explanation:

Si Ma: In ancient times, four horses were used to pull a cart. Once a sentence was spoken, even a cart with four horses could not catch up; an adjective was spoken; it could not be taken back. Also known as " One word: "It's hard to catch up with the horse" or simply "It's hard to catch up with the horse".

Source:

The third chapter of "Wu Yuan Chuo" written by Li Shouqing of the Yuan Dynasty: "A Word from a Real Man" It’s hard to catch up once it’s gone, so there’s no reason to regret it.”

Example:

This is what you promised; a real man~; don’t regret it.