Definition of "horse-collar" [horse-collar]

• A collar, commonly made of leather stuffed with hay or straw, and having creases to receive the hames, placed over a horse's neck and against the shoulder, to bear against in pulling. See cut under harness. (noun)

The Century Dictionary (Public Domain)

• "That type of tackle, known as a horse-collar tackle, was made illegal after the season was over."
• "The Pro Bowler was fined $15,000 after Week 1 for making a horse-collar tackle on Baltimore Ravens running back Ricky Williams."
• "In other Eagles news, quarterback Kevin Kolb has been fined $5,000 for administering a horse-collar tackle, Fox's Jay Glazer reports."