martingale
person 1: hey, what happened to your face?  person 2: i forgot to put my horses martingale on again
the most amazing piece of equipment that a horse wears around its neck to prevent it from smashing you in the face
"person 1: hey, what happened to your face?  person 2: i forgot to put my horses martingale on again" What is the definition of "martingale"?