What is good for the goose is good for the gander?

The phrase "what is good for the goose is good for the gander" is an idiom that means what is appropriate or acceptable for one person should also be appropriate or acceptable for another person in a similar situation. In other words, the same standards or rules should apply to everyone.

This expression is often used to emphasize the principle of fairness and equality, suggesting that people should be treated equally and receive the same benefits or consequences for their actions. It is a way of advocating for consistency and showing that double standards or hypocrisy are not acceptable.

Overall, this idiom highlights the importance of treating others with fairness and respect, and reminds us to consider how we would feel if the situation were reversed.