The phrase "are the mark" can be replaced with various synonyms depending on the context. In a game of darts, "are the mark" could be substituted with "are the target" or "are the bullseye." In a conversation about someone's weakness, "are the mark" could be replaced with "are the Achilles heel" or "are the weak spot." When discussing the accuracy of something, "are the mark" could be swapped with "are on point" or "are precise." In any situation, it's important to choose the right synonym to convey the intended meaning.