tipster
noun [ C ] uk/ˈtɪp.stər/ us/ˈtɪp.stɚ/
（尤指兜售比赛可能获胜者预测信息的）胜率预测者;（尤指向政府机构告发犯罪者的）举报者，告密者
a person who gives information to people, usually in exchange for money, especially about the likely winner of a race or competition, or who gives information to an official organization, especially about someone who has done something wrong
All the tipsters were wrong about the gold medal winner. 所有的胜率预测者都弄错了金牌得主。
An anonymous tipster has leaked confidential government information to the press. 一个匿名的泄密者向媒体透露了政府机密。