If you unbind something or someone, you take off a piece of cloth, string, or rope that has been tied round them. She unbound her hair and let it flow loose in the wind Many cultures still have fairly strict rules about women displaying unbound hair
To remove a band from; to set free from shackles or fastenings; to unite; to unfasten; to loose; as, unbind your fillets; to unbind a prisoner's arms; to unbind a load