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Results found in several dictionaries: Collins, Collaborative Dictionary
happy hunting ground 
  n 
1 (in American Indian legend) the paradise to which a person passes after death 
2 a productive or profitable area for a person with a particular interest or requirement 
jumble sales proved happy hunting grounds in her search for old stone jars  

Collaborative Dictionary     English-English
game hunter n. a person who hunts wild animals HUNTING 
to dig nnpl. to make a hole in ground, with a spade for example  

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