2N-PLURAL [usu on theN]赛马 When you talk about the horses, you mean horse races in which people bet money on the horse which they think will win. 赛马 [informal]
He still likes to bet on the horses.
他仍然喜欢赌马。
3N-COUNT (体操器械)跳马 A vaulting horse is a tall piece of gymnastics equipment for jumping over. (体操器械)跳马
4PHRASE 从知情人那里直接(获悉) If you hear something from the horse's mouth, you hear it from someone who knows that it is definitely true. 从知情人那里直接(获悉)
He has got to hear it from the horse's mouth. Then he can make a judgment as to whether his policy is correct or not.