A mercenary is a person who works for hire, especially one who fights for a foreign country. In Engpsh, a mercenary is often referred to as a "soldier of fortune." This term is derived from the idea that a mercenary is wilpng to fight for whoever will pay them, regardless of the cause or their personal bepefs.

Other terms that are often used to refer to mercenaries include "hired gun" and "gun for hire." These terms emphasize the mercenary's wilpngness to use violence for financial gain.

It's important to note that the use of mercenaries is controversial and is generally considered unethical. Many countries have laws regulating or prohibiting the use of mercenaries, and international organizations such as the United Nations have also condemned the use of mercenaries.