The phrase "in full swing" means that something is happening at its maximum level or with great energy and activity. It can be used to describe a situation, event, or period of time when everything is moving forward with enthusiasm and vigor. For example, if we say that the construction work on a building project is in full swing, it implies that the workers are working hard and making rapid progress towards completion. Similarly, if we say that a party or celebration is in full swing, it means that everyone is enjoying themselves and having a good time. In short, "in full swing" indicates that something is happening with great energy and activity.