haystack
noun /ˈheɪstæk/
  /ˈheɪstæk/
(also less frequent hayrick 
Idioms  /ˈheɪrɪk/
  /ˈheɪrɪk/
)- a large pile of hay, used as a way of storing it until it is needed
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Idioms 
a needle in a haystack 
- a thing that is almost impossible to find
- Searching for one man in this city is like looking for a needle in a haystack.
 
 
