
A needle in a haystack
Metaphorical Use
It's used metaphorically to express a difficult search among many possibilities.

Her journal had lots of ideas, finding the best one was a needle in a haystack.
Hyperbole
The phrase often exaggerates difficulty for effect, but doesn't always mean impossible.

With all these keys, locating the right one is like finding a needle in a haystack.
Common Usage
Often used in everyday conversation, suggesting a shared understanding of the difficulty.

Asking Alex to arrive on time is like looking for a needle in a haystack.
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