To see a string in your dream represents binding, cohesion, or joining, depending on the context of the dream. It relates to the strength of your involvement in a project, situation, or relationship. Perhaps, you are having concerns about your ability to hold some situation or relationship together. Alternatively, the dream indicates that you need to use your position and leverage to get what you want. Consider the phrase “pulling strings.”
To dream that you are tying a string indicates something you have forgotten to do.
To dream that you are untangling a string suggests that there is some issue in your waking life that you need to straighten.