horsecollars
Oval neck equipment
A horsecollar is the padded collar fitted around a draft horse's neck, allowing the animal to pull heavy loads.
In American football, a horsecollar tackle—grabbing the back of a player's collar or shoulder pads to bring them down—is illegal due to injury risk.
As a verb, to horsecollar someone is to tackle them this way: He was flagged for horsecollaring the quarterback.