Entry 1 sense Webster, 1913 Unbrace · Un·brace · IPA /ʌnˈbɹeɪs/ 01 v. t. To free from tension; to relax; to loose; as, to unbrace a drum; to unbrace the nerves. 1. To free from tension; to relax; to loose; as, to unbrace a drum; to unbrace the nerves.