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
noun [专属名词]情报贩子;密报者
Days later, Dozier was rescued by an Italian SWAT team, after a tipster led them to his location. 几天后,意大利反恐特警组救出了多兹尔将军,一名线人带领他们找到关押他的地点。