the holy grail Meaning in the Cambridge English Dictionary
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Meaning of “the holy grail” in the English Dictionary

"the holy grail" in British English

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the holy grailnoun [S]

uk   /ˌhəʊ.liˈɡreɪl/  us   /ˌhoʊ-/
(also the Holy Grail) a ​cupbelieved to have been used by ​JesusChrist at the ​meal before his ​death something that is ​extremelydifficult to ​find or get: Sustained ​nuclearfusion is the ​holy grail of the ​powerindustry.
(Definition of the holy grail from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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