万无一失 (wàn wú yī shī) | Meaning: surefire; absolutely safe (idiom) | Chinese Idiom with Pinyin & Origin

(idiom) to be a cinch; in the bag · (idiom) (of a person) confident of success十拿九稳shí ná jiǔ wěn

grasp it and victory is assured · to have success within one's grasp (idiom)稳操胜券wěn cāo shèng quàn

no danger of anything going wrong · no risk at all百无一失bǎi wú yī shī

surefire; absolutely safe (idiom)