Definition of “a needle in a haystack” - English Dictionary

british dictionary

“a needle in a haystack” in British English

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a needle in a haystack

something that is impossible or extremely difficult to find, especially because the area you have to search is too large:

Finding the piece of paper I need in this huge pile of documents is like looking for/trying to find a needle in a haystack

(Definition of “a needle in a haystack” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)