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English definition of “Achilles heel”

Achilles heel

noun [C usually singular]     /əˌkɪl.iːzˈhiːl/
a small fault or weakness in a person or system that can result in failure: A misbehaving minister is regarded as a government's Achilles heel and is expected to resign.Faults and mistakesWeakness and vulnerability
(Definition of Achilles heel noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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