needle in a haystack
IDIOM
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English Dictionarya needle in a haystacksomething which is impossible or extremely difficult to find, especially because the area you have to search is too large:
looking for/trying to find a needle in a haystack [TahlilGaran] Advanced Learner's Dictionary ▲
Idiomsneedle in a haystacksomething extremely hard to find. It's pretty much a needle in a haystack because these fish are extremely hard to find.Usage notes: also used in the forms look for a needle in a haystack and find a needle in a haystackEtymology: based on the idea that it is to almost impossible to find a thin sewing needle in a haystack (= a very tall pile of dried grass) [TahlilGaran] English Idioms Dictionary ▲
needle in a haystack n. phr.,
informal Something that will be very hard to find.
"I lost my class ring somewhere in the front yard," said June. Jim answered, "Too bad. That will be like finding a needle in a haystack." [TahlilGaran] English Idioms Dictionary ▲