A more thorough explanation:

Definition: A legal action that is brought without a genuine intention to win, but rather to deceive or harass the other party. It is similar to a frivolous lawsuit.

Example: A person files a lawsuit against their neighbor for playing loud music at night, even though they know that the neighbor is not responsible for the noise. The person's real intention is to harass the neighbor and cause them trouble.

This example illustrates a sham suit because the person is not genuinely trying to win the case, but rather using the legal system to harass their neighbor.