Horse  —n. 1 a large four-legged mammal with flowing mane and tail, used for riding and to carry and pull loads. B adult male horse; stallion or gelding. C (collect.; as sing.) Cavalry. 2 vaulting-block. 3 supporting frame (clothes-horse). —v. (-sing) (foll. By around) fool about.  from the horse's mouth colloq. (of information etc.) From the original or an authoritative source. [old english]