straight from the horse's mouth
口语·强调信息可靠
例句
I heard it straight from the horse's mouth—the boss said we're getting a bonus this year.
典故来源
源自赛马领域，赛马爱好者通过观察马嘴判断马龄和健康状况，因此从马主或骑师处直接获得的信息最可靠。