Which verb means to cheat or trick someone?

The verb "cozen" specifically means to cheat, trick, or deceive someone, often in a cunning or sly manner. This term has historical connotations related to swindling or outsmarting someone to gain an advantage, particularly in financial contexts. The root of the word suggests a form of deception that involves manipulation or misrepresentation, making it straightforward in its application.

In contrast, the other choices do not convey this meaning of deception effectively. "Defalcate" refers to the act of embezzling funds or misappropriating resources, but it is more focused on financial wrongdoing rather than general trickery. "Countenance" means to tolerate or support something, which is unrelated to deception. "Cavil" refers to making petty or trivial objections, and while it involves arguing or disputing, it does not imply the act of cheating or tricking someone. Therefore, "cozen" stands out as the best fit for the question.