Dreaming about a cord may be interpreted as an indication of connection and commitment. For example, the cord could represent a marriage or it could represent an emotional connection between two people.
If the cord was tied tightly, you may be feeling very protective of this person or thing. If it was tied loosely, then it may signify that this person or thing is not an important part of your life anymore.
If the cord is knotted in a dream, then it could mean that you feel strenuous emotions such as anger, guilt or envy towards another person.