If you saw someone else swimming in the lake in your dream: You may be in indecisive behavior in the morning, you may meet new people, exchange ideas. To see someone else swimming in the lake in your dream indicates that you have difficulty in going through a thoughtful period, especially in making decisions and progressing on issues that will affect your future. It also corresponds to regret for the wrong decisions he will make. Someone else's swimming in the lake also indicates that the person should act with logic and should get help from a knowledgeable person.