The term ‘defamation’ describes an untrue statement that’s been presented as fact and causes harm to the character of the person it describes. If someone’s reputation is damaged because of a false statement, this statement will be considered defamatory.
Should an opinion be considered an accusation, and be untrue, this still defames the person in question.
Does this mean that if A alleges B defamed him, if a judge decides that A is wrong, does that mean A has defamed B?