Call your bluff

The phrase "Call your bluff" means to challenge or question someone's statement, claim, or threat, often doubting its truthfulness or sincerity. It is often used in situations where one person suspects or believes that the other person is bluffing or bluffing their way through a situation. By calling someone's bluff, one is inviting the person to prove or back up their statement, claim, or threat, or otherwise admit that it was not genuine.