Untie
Part of speech: verb
Definition: To loosen, as something interlaced or knotted; to disengage the parts of; as, to untie a knot. To free from fastening or from restraint; to let loose; to unbind. To resolve; to unfold; to clear. To become untied or loosed.
Unbrace
Part of speech: verb
Definition: To undo, unfasten; to relax, loosen.