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English definition of “Holy Grail”

Holy Grail

noun [C] ( also holy grail)  /ˈhoʊ·li ˈɡreɪl/ us  
something that a person or a particular group of people want very much to have or achieve: Earth-like planets - the holy grail of planet hunting - are too small to detect. The Holy Grail is also the cup Jesus was believed to have drunk from during his last meal with his disciples .
(Definition of Holy Grail from the Cambridge Academic Content Dictionary © Cambridge University Press)
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