The phrase "fair game" is typically used to describe something or someone that is considered a legitimate target for criticism or attack. However, there are several synonyms that can be used to convey a similar meaning. For instance, the term "legitimate target" is often used to describe something that is considered acceptable or appropriate to criticize or attack. Other synonyms include "open season," which implies that someone or something is vulnerable and can be targeted by anyone, and "fair play," which suggests that all parties involved are playing by the same rules and are therefore judged on their merits. Ultimately, the choice of synonym will depend on the specific context and tone of the situation.