To hear something straight from the horse's mouth
从最可靠或权威的来源直接获取信息，确保真实性。
用于强调信息直接来自当事人或官方。
英文释义
To hear something from the authoritative source.
例句
I heard the news straight from the horse's mouth: the CEO himself.
典故来源
源自赛马术语，马匹年龄看牙齿，从马嘴直接得知信息最准确，引申为权威来源。