The phrase "rub salt into the wound" means to intentionally cause someone further distress or annoyance that worsens an already unpleasant situation. However, there are several alternative phrases that can be used to convey the same meaning. Some of these include adding insult to injury, hitting a sore spot, twisting the knife, pouring salt on the wound, or aggravating an issue. These phrases often refer to situations where someone is already experiencing discomfort or discomfort, and another party intentionally makes that experience worse. They are used to describe actions that are insensitive, unnecessary, or unhelpful in dealing with an uncomfortable situation.