horseshoe UK /ˈhɔːs.ʃuː/US /ˈhɔːɹs.ʃuː/noun 6verb 1forms 4phrases 1 noun6 •The U-shaped shoe of a horse, now typically made of metal; by extension, a representation of this used to play the game horseshoes, hung as a luck charm, etc.And what has been thus affirmed of other leading commodities; the blacksmith, for example, no longer making, but buying his horseshoes, nails, nuts, and bolts — 1887 •The U shape of a horseshoe.Whereas the railway heads inland to take the easier but much longer horseshoe-shaped route around the firth, the A9 directly crosses it from north to south on a bridge built in 1991. — 2021 •An open-faced sandwich originating from Springfield, Illinois, consisting of thick-sliced toasted bread, often Texas toast, a hamburger patty, French fries, and a cheese sauce. •A U-shaped life buoy. •The symbol ⊃. •(slang) A well-developed set of triceps brachii muscles.The lateral head of your triceps forms the outside of the horseshoe, the long head forms the inside, the medial head lies beneath the long head, and the tendon occupies the flat space in the middle. — 2004 verb1 •To apply horseshoes to (a horse). formshorseshod · horseshoed · horseshoeing · horseshoes Phrases with horseshoe horseshoe up one's assExceptionally favorable personal luck.