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Open the tool →百无一失 (bǎi wú yī shī) is a Chinese idiom (chengyu) meaning “Absolutely foolproof”.
百无一失 is pronounced bǎi wú yī shī in Mandarin Chinese.
Literally, 百无一失 means “a hundred without one mistake”. It is used to mean “Absolutely foolproof”.
形容有充分把握,绝对不会出差错。