wàn万ten thousandwú无noyī一oneshī失mistake
Perfectly safe; foolproof; absolutely sure.
Literal meaning
ten thousand (万) — no (无) — one (一) — mistake (失)
Origin
A classical four-character phrase describing a situation where there is no chance of failure.
Examples
Zhè这ge个jì计huà划wàn万wú无yī一shī失，yī一dìng定néng能chéng成gōng功。
This plan is foolproof and will definitely succeed.
Wǒ我men们yào要què确bǎo保zhè这cì次xíng行dòng动wàn万wú无yī一shī失。
We need to ensure that this operation is perfectly safe.
Usage & nuances
Emphasizes the certainty of success and the absence of risk.
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