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A tipster is someone who tells you, usually in exchange for money, which horses they think will win particular races, so that you can bet money on the horses. (提供赛马内幕消息的)情报贩子
This urban setting has been pointed out by anonymous tipsters, who have come forward after 25 years, as the suspected final resting place of at least four people who disappeared during the civil war that raged in Guatemala during the 1980s.
VOA: standard.2009.12.18
"Mack was the top possibility" of several possible tipsters, Aguirre said at the hearing.