To "swindle" someone means to:

To "swindle" someone involves deceit and trickery with the intent of obtaining money or property through dishonest means. This definition emphasizes the act of cheating or defrauding an individual, often leaving them at a financial loss. The term is commonly associated with schemes or manipulations where one party misrepresents the truth to gain an unfair advantage over another.

In contrast, the other choices present actions related to helping or supporting individuals in their financial or business endeavors, which does not align with the concept of swindling. Helping someone achieve financial success or encouraging honest transactions involves positive and ethical behavior, while assisting in business ventures implies collaboration aimed at mutual benefit. Each of these alternatives reflects a constructive approach, further highlighting that "swindle" distinctly refers to deceitful actions rather than supportive ones.