The string is the symbolism of the connection between 2 people. Sometimes the string shows that you are too much attached to particular person, therefore you see the string. Some people feel the necessity for more personal space, but certain relationships or lifestyle doesnt provide that, these people also dream about string. If you are winding the string or make the place tidy by tying the strings, it shows your tendency to keep everything organized. You tend to keep things clear.
Read more about dreaming of String in other dream meanings interpretations.