Soldiers and wrists were bitten by Agkistrodon halys, and they were immediately cut to prevent the toxin from spreading to the whole body.

Refers to the warrior's wrist bitten by a poisonous snake, which should be cut off immediately to avoid the toxicity spreading to the whole body. Metaphor is decisive, without hesitation and without tolerance.

[Pinyin]

Man surnamed Zhang

[source]

Tang Doushou's Writing a Book: "A gentleman abandons flaws to paint talents, and a strong man breaks his wrist to be all-round."

[near meaning]

Be decisive in your work, and don't do anything wrong.