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During the Shang Dynasty, Jiang Shang (also known as Jiang Taigong) was exceptionally learned and skilled in military strategy. However, due to his poverty, his wife, Ma Shi, left him, believing he was old and had no prospects.
He then built a thatched hut by the Wei River and lived by fishing.
Later, King Wen of Zhou recognized his talent and appointed him as his national tutor. Jiang Taigong assisted King Wen in overthrowing the Shang Dynasty.
After his success, his former wife, Ma Shi, sought to reunite with him. Jiang Taigong took a basin of water, poured it on the ground, and told her that if she could collect all the spilled water, they would reconcile.
This illustrated the irreversible nature of their separation, just like spilled water cannot be recovered.

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Open the tool →反水不收 (fǎn shuǐ bù shōu) is a Chinese idiom (chengyu) meaning “describes a situation or action that is irreversible”.
反水不收 is pronounced fǎn shuǐ bù shōu in Mandarin Chinese.
Literally, 反水不收 means “Spilled water cannot be retrieved”. It is used to mean “describes a situation or action that is irreversible”.
反水不收 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
水已泼出去,不能再收回。比喻不可挽回。