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English definition of “secret weapon”

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secret weapon

noun [C] uk   us  
something or someone that no one knows about and that will give you an advantage over your competitors or enemies: Johann was the bank robbers' secret weapon - he knew how the security system worked.
Translations of “secret weapon”
in Chinese (Traditional) 秘密武器, 殺手鐧…
in Chinese (Simplified) 秘密武器, 杀手锏…
(Definition of secret weapon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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