What is the meaning of Bruiser?

In contact sports, an athlete whose size, strength, and/or aggressiveness make it likely that they will cause athletes on the opposing team to suffer physical punishment.

A tall, strong, heavily built person, usually a man, especially one prone to physical violence; a strong and tough person.

A machine for bruising oats.

A person who enjoys arguing with others.

A professional boxer.

Source: wiktionary.org