In a book I'm reading a character says "One day I will have you, de Vienne.", refering to her master, who she doesn't like. What does it mean, exactly? I guess it's something like "I will kill you someday", which is possible because they fight with swords. Thank you!
In the context of musing over or taunting an opponent, "I will have you" would imply that the opponent has, to this point in time, eluded or defeated the speaker. The speaker is indicating that they will make efforts to be victorious in the future and depending on the context this could be a direct taunt to the opponent or an internal, personal musing by the speaker.