Longman Dictionary of Contemporary English homepage

Holy Grail

 noun
     
Holy Grail
1 [singular] something that people want very much, but which is very difficult or impossible to achieve
Holy Grail of
Nuclear fusion is the Holy Grail of energy production.
2

the Holy Grail

the cup believed to have been used by Christ before his death
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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