Definition of "horseshoe"
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.
Quotations
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, David A. Wells, "The Economic Disturbances since 1873", III, Popular Science 31 (no. 37): 595
verb
third-person singular simple present horseshoes, present participle horseshoeing, simple past and past participle horseshoed or horseshod