tip·ster /ˈtɪpstɚ/
  密報者,預測者,提供情報者
  Tip·ster n.  One who makes a practice of giving or selling tips, or private hints or information, esp. for use in gambling upon the probable outcome of events, as horse races.
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  tipster
       n : one who sells advice about gambling or speculation
           (especially at the racetrack) [syn: tout]