It symbolizes the union, the union until death, and if possible, beyond. This dream reveals our inner desire to form an imperishable union with someone or something. To see ourselves tied means a tie that weighs too much on us. If we manage to untie ourselves we will find liberation. If we tie someone else it means we will commit an injustice, unless it is a person of the opposite sex, then it means attraction.
Read more about dreaming of Knot in other dream meanings interpretations.